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<meta name="keywords" content="C0002902, absence of a large part of the brain and the skull, absence of brain, congenital, anencephalia, anencephalias, anencephalus, anencephaly, anph, brain congenital absence, congenital abnormality, congenital absence of brain, embryonic anencephaly, fetal anencephaly, foetal anencephaly, autosomal dominant, autosomal recessive, birth defects, chromosomal disease, chromosome, clinical features, clinical findings, clinical genetics, clinical recommendations, clinvar, congenital chromosomal disease, consumer genetic resources, cytogenetic location, disease characteristics, disease definitions, disease descriptions, disease ontology, disease synonyms, disease vocabulary, dysmorphology, entrez, familial disease, gene, gene-disease relationship, genereviews, genetic disease, genetic disorder, genetic terminology, genetic testing registry, genetics home reference, genomic disease, gtr, hereditary disease, heritable disease, hpo, human phenotype ontology, inherited disease, management guidelines, maternal inheritance, medgen, medical genetics, medical subject headings, mesh, mitochondrial inheritance, mode of inheritance, national center for biotechnology information, national institutes of health, national library of medicine, ncbi, nih, nlm, omim, ordo, orphanet, paternal inheritance, phenome, position statements, professional practice guidelines, rare disease, reference sequence, refseq, snomed ct, syndrome, undiagnosed diseases, x-linked recessive" /><meta name="description" content="Anencephaly is a condition that prevents the normal development of the brain and the bones of the skull. This condition results when a structure called the neural tube fails to close during the first few weeks of embryonic development. The neural tube is a layer of cells that ultimately develops into the brain and spinal cord. Because anencephaly is caused by abnormalities of the neural tube, it is classified as a neural tube defect.\n\nBecause these nervous system abnormalities are so severe, almost all babies with anencephaly die before birth or within a few hours or days after birth.\n\nBecause the neural tube fails to close properly, the developing brain and spinal cord are exposed to the amniotic fluid that surrounds the fetus in the womb. This exposure causes the nervous system tissue to break down (degenerate). As a result, people with anencephaly are missing large parts of the brain called the cerebrum and cerebellum. These brain regions are necessary for thinking, hearing, vision, emotion, and coordinating movement. The bones of the skull are also missing or incompletely formed." /><meta name="robots" content="index,nofollow,noarchive" />
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<!--
UID=8068
ConceptID=C0002902
-->
<!--imgCountBooks = 0--><h1 class="medgenTitle"><div class="MedGenTitleText">Anencephaly</div></h1><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>8068</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information."><span class="highlight" style="background-color:">C0002902</span></a></dd><dt><span class="dotprefix"></span></dt><dd>Congenital Abnormality</dd></dl></div></div><table class="medgenTable"><tbody><tr><td>Synonyms:</td>
<td>Absence of a large part of the brain and the skull; Anencephalus</td></tr>
<tr><td><span class="bold">SNOMED CT: </span></td>
<td>Anencephalus (89369001); Anencephaly (89369001); Fetal anencephaly (609417004); Congenital absence of brain (89369001)</td></tr>
<tr><td colspan="2" class="small"> </td></tr><tr><td>HPO:</td>
<td><a target="_blank" title="Human Phenotype Ontology" href="https://hpo.jax.org/app/browse/term/HP:0002323">HP:0002323</a></td></tr>
<tr><td>Monarch Initiative:</td>
<td><a href="https://monarchinitiative.org/disease/MONDO:0000819" target="_blank">MONDO:0000819</a></td></tr>
<tr><td>OMIM<span class="superscript">®</span>:</td>
<td><a href="https://omim.org/entry/206500" target="_blank">206500</a></td></tr>
<tr><td>OMIM<span class="superscript">®</span> Phenotypic series:</td>
<td><a href="https://omim.org/phenotypicSeries/PS206500" target="_blank">PS206500</a></td></tr>
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<div class="portlet mgSection" id="ID_100">
<div class="portlet_head mgSectionHead ui-widget-header"><h1 class="nl" id="Definition">Definition</h1><a sid="100" href="#" class="portlet_shutter" title="Show/hide content"></a></div>
<div class="portlet_content ln">Anencephaly is a condition that prevents the normal development of the brain and the bones of the skull. This condition results when a structure called the neural tube fails to close during the first few weeks of embryonic development. The neural tube is a layer of cells that ultimately develops into the brain and spinal cord. Because anencephaly is caused by abnormalities of the neural tube, it is classified as a neural tube defect.<br /><br />Because these nervous system abnormalities are so severe, almost all babies with anencephaly die before birth or within a few hours or days after birth.<br /><br />Because the neural tube fails to close properly, the developing brain and spinal cord are exposed to the amniotic fluid that surrounds the fetus in the womb. This exposure causes the nervous system tissue to break down (degenerate). As a result, people with anencephaly are missing large parts of the brain called the cerebrum and cerebellum. These brain regions are necessary for thinking, hearing, vision, emotion, and coordinating movement. The bones of the skull are also missing or incompletely formed. [from <a title="MedlinePlus Genetics" href="https://medlineplus.gov/genetics/" class="defSource" target="_blank">MedlinePlus Genetics</a>]</div>
</div>
<div class="portlet mgSection" id="ID_118">
<div class="portlet_head mgSectionHead ui-widget-header"><h1 class="nl" id="Term_Hierarchy">Term Hierarchy</h1><a sid="118" href="#" class="portlet_shutter" title="Show/hide content"></a></div>
<div class="portlet_content ln HierarchyGTR"><div class="jig-ncbitabs"><ul><li><a href="#tabGTR">GTR</a></li><li><a href="#tabMGEN">MeSH</a></li><li><a href="#tabORDO">Orphanet</a></li></ul><div id="tabGTR"><div class="search_result"><div class="rprts"><div class="chiclet_legend"><span class="chiclet_list" style="position:static;"><span title="Clinical test" class="chiclet Ccolor round">C</span><span>Clinical test,  </span><span title="Research test" class="chiclet Rcolor round">R</span><span>Research test,  </span><span title="OMIM" class="chiclet Ocolor ">O</span><span>OMIM,  </span><span title="GeneReview" class="chiclet Gcolor">G</span><span><em>GeneReviews</em>,  </span><span title="ClinVar" class="chiclet Vcolor">V</span><span>ClinVar  </span></span></div><div id="hierarchy" class="margin_t1"><div class="ds_tree"><ul><li class="TLclosed"><span class="chiclet_list"><span class="chiclet Ccolor round" title="Clinical test"><a target="_blank" href="/gtr/tests/?term=C0027794[DISCUI]&amp;test_type=Clinical" ref="ncbi_uid=18009">C</a></span><span class="chiclet Rcolor round" title="Research test"><a target="_blank" href="/gtr/tests/?term=C0027794[DISCUI]&amp;test_type=Research&amp;redirect=true" ref="ncbi_uid=18009">R</a></span><span class="chiclet unavailable" title="OMIM">O</span><span class="chiclet unavailable" title="GeneReviews">G</span><span class="chiclet Vcolor" title="ClinVar"><a target="_blank" href="/clinvar?LinkName=medgen_clinvar&amp;from_uid=18009" ref="ncbi_uid=18009">V</a></span></span><span class="TLline"><a href="/medgen/18009" ref="tree=GTR&amp;ncbi_uid=18009&amp;link_uid=18009" title="View MedGen record for 'Neural tube defect'">Neural tube defect</a></span><ul><li class="matched_ds"><span class="chiclet_list"><span class="chiclet Ccolor round" title="Clinical test"><a target="_blank" href="/gtr/tests/?term=C0002902[DISCUI]&amp;test_type=Clinical&amp;redirect=true" ref="ncbi_uid=8068">C</a></span><span class="chiclet unavailable round" title="Research Tests">R</span><span class="chiclet Ocolor" title="OMIM"><a ref="ncbi_uid=8068" target="_blank" href="/omim/206500">O</a></span><span class="chiclet unavailable" title="GeneReviews">G</span><span class="chiclet Vcolor" title="ClinVar"><a target="_blank" href="/clinvar?LinkName=medgen_clinvar&amp;from_uid=8068" ref="ncbi_uid=8068">V</a></span></span><span class="TLline">Anencephaly</span></li><li class="TLclosed"><span class="chiclet_list"><span class="chiclet unavailable round" title="Clinical test">C</span><span class="chiclet unavailable round" title="Research Tests">R</span><span class="chiclet unavailable" title="OMIM">O</span><span class="chiclet unavailable" title="GeneReviews">G</span><span class="chiclet unavailable" title="ClinVar">V</span></span><span class="TLline"><a href="/medgen/56290" ref="tree=GTR&amp;ncbi_uid=56290&amp;link_uid=56290" title="View MedGen record for 'Craniorachischisis'">Craniorachischisis</a></span></li><li class="TLclosed"><span class="chiclet_list"><span class="chiclet unavailable round" title="Clinical test">C</span><span class="chiclet unavailable round" title="Research Tests">R</span><span class="chiclet Ocolor" title="OMIM"><a ref="ncbi_uid=856010" target="_blank" href="/omim/182940">O</a></span><span class="chiclet unavailable" title="GeneReviews">G</span><span class="chiclet Vcolor" title="ClinVar"><a target="_blank" href="/clinvar?LinkName=medgen_clinvar&amp;from_uid=856010" ref="ncbi_uid=856010">V</a></span></span><span class="TLline"><a href="/medgen/856010" ref="tree=GTR&amp;ncbi_uid=856010&amp;link_uid=856010" title="View MedGen record for 'Neural tube defects, susceptibility to'">Neural tube defects, susceptibility to</a></span></li><li class="TLclosed"><span class="chiclet_list"><span class="chiclet unavailable round" title="Clinical test">C</span><span class="chiclet unavailable round" title="Research Tests">R</span><span class="chiclet Ocolor" title="OMIM"><a ref="ncbi_uid=38283" target="_blank" href="/omim/182940">O</a></span><span class="chiclet unavailable" title="GeneReviews">G</span><span class="chiclet unavailable" title="ClinVar">V</span></span><span class="TLline"><a href="/medgen/38283" ref="tree=GTR&amp;ncbi_uid=38283&amp;link_uid=38283" title="View MedGen record for 'Spina bifida'">Spina bifida</a></span><ul><li class="TLclosed"><span class="chiclet_list"><span class="chiclet Ccolor round" title="Clinical test"><a target="_blank" href="/gtr/tests/?term=C0080174[DISCUI]&amp;test_type=Clinical" ref="ncbi_uid=36380">C</a></span><span class="chiclet unavailable round" title="Research Tests">R</span><span class="chiclet unavailable" title="OMIM">O</span><span class="chiclet unavailable" title="GeneReviews">G</span><span class="chiclet Vcolor" title="ClinVar"><a target="_blank" href="/clinvar?LinkName=medgen_clinvar&amp;from_uid=36380" ref="ncbi_uid=36380">V</a></span></span><span class="TLline"><a href="/medgen/36380" ref="tree=GTR&amp;ncbi_uid=36380&amp;link_uid=36380" title="View MedGen record for 'Spina bifida occulta'">Spina bifida occulta</a></span></li></ul></li></ul></li></ul></div></div></div></div></div><div id="tabMGEN"><div class="ds_tree"><ul><li><span class="TLline"><a href="/medgen/867443" ref="tree=MeSH" title="MedGen record for Phenotypic abnormality">Phenotypic abnormality</a></span><ul><li><span class="TLline"><a href="/medgen/871309" ref="tree=MeSH" title="MedGen record for Abnormality of prenatal development or birth">Abnormality of prenatal development or birth</a></span><ul><li><span class="TLline"><a href="/medgen/1254" ref="tree=MeSH" title="MedGen record for Fetal anomaly">Fetal anomaly</a></span><ul><li><span class="TLline"><a href="/medgen/438147" ref="tree=MeSH" title="MedGen record for Abnormalities, Severe Teratoid">Abnormalities, Severe Teratoid</a></span><ul><li><span class="matched_ds">Anencephaly</span><ul><li><span class="TLline"><a href="/medgen/6937" ref="tree=MeSH" title="MedGen record for Hydranencephaly">Hydranencephaly</a></span></li></ul></li></ul></li></ul></li></ul></li></ul></li></ul></div></div><div id="tabORDO">Follow <a target="_blank" href="http://www.orpha.net/consor/cgi-bin/Disease_Classif.php?lng=EN&amp;data_id=156&amp;PatId=5014&amp;search=Disease_Classif_Simple&amp;new=1" class="ital bold">this link</a> to review classifications for <span class="ital">Anencephaly</span> in Orphanet.</div></div></div>
</div>
<div class="portlet mgSection" id="ID_112">
<div class="portlet_head mgSectionHead ui-widget-header"><h1 class="nl" id="Conditions_with_this_feature">Conditions with this feature</h1><a sid="112" href="#" class="portlet_shutter" title="Show/hide content"></a></div>
<div class="portlet_content ln clinfeat">
<div class="divPopper rprt" id="rdis_96578"><div><strong>Type IV short rib polydactyly syndrome</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>96578</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C0432198</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Short-rib thoracic dysplasia (SRTD) with or without polydactyly refers to a group of autosomal recessive skeletal ciliopathies that are characterized by a constricted thoracic cage, short ribs, shortened tubular bones, and a 'trident' appearance of the acetabular roof. SRTD encompasses Ellis-van Creveld syndrome (EVC) and the disorders previously designated as Jeune syndrome or asphyxiating thoracic dystrophy (ATD), short rib-polydactyly syndrome (SRPS), and Mainzer-Saldino syndrome (MZSDS). Polydactyly is variably present, and there is phenotypic overlap in the various forms of SRTDs, which differ by visceral malformation and metaphyseal appearance. Nonskeletal involvement can include cleft lip/palate as well as anomalies of major organs such as the brain, eye, heart, kidneys, liver, pancreas, intestines, and genitalia. Some forms of SRTD are lethal in the neonatal period due to respiratory insufficiency secondary to a severely restricted thoracic cage, whereas others are compatible with life (summary by Huber and Cormier-Daire, 2012 and Schmidts et al., 2013).&#13; There is phenotypic overlap with the cranioectodermal dysplasias (Sensenbrenner syndrome; see CED1, 218330). Patients with a clinical diagnosis of Beemer-Langer syndrome have been found to carry mutations in the IFT80 gene (611177); see SRTD2, 611263.&#13; For a discussion of genetic heterogeneity of short-rib thoracic dysplasia, see SRTD1 (208500).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/96578">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_107540"><div><strong>Pentalogy of Cantrell</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>107540</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C0559483</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Pentalogy of Cantrell (POC) is a lethal multiple congenital anomalies syndrome, characterized by the presence of 5 major malformations: midline supraumbilical abdominal wall defect, lower sternal defect, diaphragmatic pericardial defect, anterior diaphragmatic defect and various intracardiac malformations. Ectopia cordis (EC) is often found in fetuses with POC.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/107540">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_167087"><div><strong>XK aprosencephaly</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>167087</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C0795952</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">A rare syndromic type of cerebral malformation with characteristics of aprosencephaly (absence of telencephalon and diencephalon), oculo-facial anomalies (such as ocular hypotelorism or cyclopia, malformation/absence of nasal structures, cleft lip), preaxial limb defects (such as hypoplastic hands, absent halluces) and various other anomalies including ambiguous genitalia, imperforate anus, and vertebral anomalies.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/167087">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_343455"><div><strong>Hydrolethalus syndrome 1</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>343455</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C1856016</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Hydrolethalus-1 (HLS1) is an autosomal recessive lethal malformation syndrome characterized by hydrocephaly with absent upper midline structures of the brain, micrognathia, and polydactyly. Various other features such as cleft lip or palate, club feet, anomalies of the ears, eyes, and nose, keyhole-shaped defect in the occipital bone, abnormal genitalia, and congenital heart and respiratory organ defects have also been observed in affected individuals. Affected individuals are stillborn or die shortly after birth (summary by Mee et al., 2005).&#13; Genetic Heterogeneity of Hydrolethalus Syndrome&#13; See also HLS2 (614120), caused by mutation in the KIF7 gene (611254) on chromosome 15q26.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/343455">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_351059"><div><strong>Meckel syndrome, type 2</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>351059</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C1864148</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Meckel syndrome is a rare autosomal recessive lethal condition characterized by an occipital meningoencephalocele, enlarged kidneys with multicystic dysplasia and fibrotic changes in the portal area of the liver and with ductal proliferation, and postaxial polydactyly. For a more complete phenotypic description and information on genetic heterogeneity, see MKS1 (249000).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/351059">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_409740"><div><strong>Meckel syndrome, type 5</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>409740</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C1969052</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Meckel syndrome is a disorder with severe signs and symptoms that affect many parts of the body. The most common features are enlarged kidneys with numerous fluid-filled cysts; an occipital encephalocele, which is a sac-like protrusion of the brain through an opening at the back of the skull; and the presence of extra fingers and toes (polydactyly). Most affected individuals also have a buildup of scar tissue (fibrosis) in the liver.\n\nBecause of their serious health problems, most individuals with Meckel syndrome die before or shortly after birth. Most often, affected infants die of respiratory problems or kidney failure.\n\nOther signs and symptoms of Meckel syndrome vary widely among affected individuals. Numerous abnormalities of the brain and spinal cord (central nervous system) have been reported in people with Meckel syndrome, including a group of birth defects known as neural tube defects. These defects occur when a structure called the neural tube, a layer of cells that ultimately develops into the brain and spinal cord, fails to close completely during the first few weeks of embryonic development. Meckel syndrome can also cause problems with development of the eyes and other facial features, heart, bones, urinary system, and genitalia.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/409740">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_410003"><div><strong>Meckel syndrome, type 4</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>410003</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C1970161</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Meckel syndrome is an autosomal recessive pre- or perinatal lethal disorder characterized by a combination of renal cysts and variably associated features including developmental anomalies of the central nervous system (typically occipital encephalocele), hepatic ductal dysplasia and cysts, and postaxial polydactyly (summary by Baala et al., 2007).&#13; For a more complete phenotypic description and information on genetic heterogeneity of Meckel syndrome, see MKS1 (249000).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/410003">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_382942"><div><strong>Meckel syndrome, type 6</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>382942</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C2676790</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Other signs and symptoms of Meckel syndrome vary widely among affected individuals. Numerous abnormalities of the brain and spinal cord (central nervous system) have been reported in people with Meckel syndrome, including a group of birth defects known as neural tube defects. These defects occur when a structure called the neural tube, a layer of cells that ultimately develops into the brain and spinal cord, fails to close completely during the first few weeks of embryonic development. Meckel syndrome can also cause problems with development of the eyes and other facial features, heart, bones, urinary system, and genitalia.\n\nBecause of their serious health problems, most individuals with Meckel syndrome die before or shortly after birth. Most often, affected infants die of respiratory problems or kidney failure.\n\nMeckel syndrome is a disorder with severe signs and symptoms that affect many parts of the body. The most common features are enlarged kidneys with numerous fluid-filled cysts; an occipital encephalocele, which is a sac-like protrusion of the brain through an opening at the back of the skull; and the presence of extra fingers and toes (polydactyly). Most affected individuals also have a buildup of scar tissue (fibrosis) in the liver.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/382942">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_481529"><div><strong>Hydrolethalus syndrome 2</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>481529</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C3279899</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Hydrolethalus syndrome is an autosomal recessive embryonic lethal disorder characterized by hydrocephaly or anencephaly, postaxial polydactyly of the upper limbs, and pre- or postaxial polydactyly of the lower limbs. Duplication of the hallux is a common finding. HLS2 is considered a ciliopathy (summary by Putoux et al., 2011).&#13; Acrocallosal syndrome (ACLS; 200990) is an allelic disorder with a less severe phenotype.&#13; For a discussion of genetic heterogeneity of hydrolethalus syndrome, see 236680.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/481529">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_481666"><div><strong>Meckel syndrome, type 10</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>481666</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C3280036</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Meckel syndrome is a disorder with severe signs and symptoms that affect many parts of the body. The most common features are enlarged kidneys with numerous fluid-filled cysts; an occipital encephalocele, which is a sac-like protrusion of the brain through an opening at the back of the skull; and the presence of extra fingers and toes (polydactyly). Most affected individuals also have a buildup of scar tissue (fibrosis) in the liver.\n\nBecause of their serious health problems, most individuals with Meckel syndrome die before or shortly after birth. Most often, affected infants die of respiratory problems or kidney failure.\n\nOther signs and symptoms of Meckel syndrome vary widely among affected individuals. Numerous abnormalities of the brain and spinal cord (central nervous system) have been reported in people with Meckel syndrome, including a group of birth defects known as neural tube defects. These defects occur when a structure called the neural tube, a layer of cells that ultimately develops into the brain and spinal cord, fails to close completely during the first few weeks of embryonic development. Meckel syndrome can also cause problems with development of the eyes and other facial features, heart, bones, urinary system, and genitalia.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/481666">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_811346"><div><strong>Meckel syndrome, type 1</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>811346</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C3714506</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Meckel syndrome, also known as Meckel-Gruber syndrome, is a severe pleiotropic autosomal recessive developmental disorder caused by dysfunction of primary cilia during early embryogenesis. There is extensive clinical variability and controversy as to the minimum diagnostic criteria. Early reports, including that of Opitz and Howe (1969) and Wright et al. (1994), stated that the classic triad of Meckel syndrome comprises (1) cystic renal disease; (2) a central nervous system malformation, most commonly occipital encephalocele; and (3) polydactyly, most often postaxial. However, based on a study of 67 patients, Salonen (1984) concluded that the minimum diagnostic criteria are (1) cystic renal disease; (2) CNS malformation, and (3) hepatic abnormalities, including portal fibrosis or ductal proliferation. In a review of Meckel syndrome, Logan et al. (2011) stated that the classic triad first described by Meckel (1822) included occipital encephalocele, cystic kidneys, and fibrotic changes to the liver.&#13; Genetic Heterogeneity of Meckel Syndrome&#13; See also MKS2 (603194), caused by mutation in the TMEM216 gene (613277) on chromosome 11q12; MKS3 (607361), caused by mutation in the TMEM67 gene (609884) on chromosome 8q; MKS4 (611134), caused by mutation in the CEP290 gene (610142) on chromosome 12q; MKS5 (611561), caused by mutation in the RPGRIP1L gene (610937) on chromosome 16q12; MKS6 (612284), caused by mutation in the CC2D2A gene (612013) on chromosome 4p15; MKS7 (267010), caused by mutation in the NPHP3 (608002) gene on chromosome 3q22; MKS8 (613885), caused by mutation in the TCTN2 gene (613846) on chromosome 12q24; MKS9 (614209), caused by mutation in the B9D1 gene (614144) on chromosome 17p11; MKS10 (614175), caused by mutation in the B9D2 gene (611951) on chromosome 19q13; MKS11 (615397), caused by mutation in the TMEM231 gene (614949) on chromosome 16q23; MKS12 (616258), caused by mutation in the KIF14 gene (611279) on chromosome 1q32; MKS13 (617562), caused by mutation in the TMEM107 gene (616183) on chromosome 17p13; and MKS14 (619879), caused by mutation in the TXNDC15 gene (617778) on chromosome 5q31.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/811346">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_815372"><div><strong>Muscular dystrophy-dystroglycanopathy (congenital with brain and eye anomalies), type A13</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>815372</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C3809042</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Congenital muscular dystrophy-dystroglycanopathy with brain and eye anomalies (type A) is a autosomal recessive disorder associated with severe neurologic defects and resulting in early infantile death. The phenotype includes the alternative clinical designations Walker-Warburg syndrome (WWS) and muscle-eye-brain disease (MEB). The disorder represents the most severe end of a phenotypic spectrum of similar disorders resulting from defective glycosylation of alpha-dystroglycan (DAG1; 128239), collectively known as dystroglycanopathies (summary by Buysse et al., 2013).&#13; For a general phenotypic description and a discussion of genetic heterogeneity of muscular dystrophy-dystroglycanopathy type A, see MDDGA1 (236670).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/815372">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_856010"><div><strong>Neural tube defects, susceptibility to</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>856010</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C3891448</a></dd><dt><span class="dotprefix"></span></dt><dd>Finding</dd></dl></div></div></div>
<div class="spaceAbove">Neural tube defects are the second most common type of birth defect after congenital heart defects. The 2 most common NTDs are open spina bifida, also known as spina bifida cystica (SBC) or myelomeningocele, and anencephaly (see 206500) (Detrait et al., 2005). Spina bifida occulta (SBO), a bony defect of the spine covered by normal skin, is a mild form of spina bifida that is often asymptomatic. The term 'spinal dysraphia' refers to both SBC and SBO (Botto et al., 1999; Fineman et al., 1982). The most severe neural tube defect, craniorachischisis (CRN), leaves the neural tube open from the midbrain or rostral hindbrain to the base of the spine (summary by Robinson et al., 2012).&#13; Neural tube defects represent a complex trait with multifactorial etiology encompassing both genetic and environmental components (summary by Bartsch et al., 2012 and Lei et al., 2014).&#13; An X-linked form of spina bifida has been suggested; see 301410. See also folate-sensitive neural tube defects (601634), which are caused by genes involved in folate metabolism.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/856010">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_901479"><div><strong>Short-rib thoracic dysplasia 14 with polydactyly</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>901479</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C4225286</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Short-rib thoracic dysplasia (SRTD) with or without polydactyly refers to a group of autosomal recessive skeletal ciliopathies that are characterized by a constricted thoracic cage, short ribs, shortened tubular bones, and a 'trident' appearance of the acetabular roof. SRTD encompasses Ellis-van Creveld syndrome (EVC) and the disorders previously designated as Jeune syndrome or asphyxiating thoracic dystrophy (ATD), short rib-polydactyly syndrome (SRPS), and Mainzer-Saldino syndrome (MZSDS). Polydactyly is variably present, and there is phenotypic overlap in the various forms of SRTDs, which differ by visceral malformation and metaphyseal appearance. Nonskeletal involvement can include cleft lip/palate as well as anomalies of major organs such as the brain, eye, heart, kidneys, liver, pancreas, intestines, and genitalia. Some forms of SRTD are lethal in the neonatal period due to respiratory insufficiency secondary to a severely restricted thoracic cage, whereas others are compatible with life (summary by Huber and Cormier-Daire, 2012 and Schmidts et al., 2013).&#13; There is phenotypic overlap with the cranioectodermal dysplasias (Sensenbrenner syndrome; see CED1, 218330).&#13; For a discussion of genetic heterogeneity of short-rib thoracic dysplasia with or without polydactyly, see SRTD1 (208500).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/901479">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1744234"><div><strong>Chromosome 13q33-q34 deletion syndrome</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1744234</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C5436890</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Chromosome 13q33-q34 deletion syndrome is associated with developmental delay and/or impaired intellectual development, facial dysmorphism, and an increased risk for epilepsy, cardiac defects and additional anatomic anomalies (summary by Sagi-Dain et al., 2019).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1744234">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1794138"><div><strong>Anencephaly 1</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1794138</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C5561928</a></dd><dt><span class="dotprefix"></span></dt><dd>Congenital Abnormality</dd></dl></div></div></div>
<div class="spaceAbove">Anencephaly is characterized by the absence of cranial vault and brain tissues in the fetus. It is considered an extreme form of neural tube defect (182940) (summary by Singh et al., 2017).&#13; Genetic Heterogeneity of Anencephaly&#13; See also anencephaly-2 (ANPH2; 619452), caused by mutation in the NUAK12 gene (608131) on chromosome 1q32.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1794138">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1794155"><div><strong>Anencephaly 2</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1794155</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C5561945</a></dd><dt><span class="dotprefix"></span></dt><dd>Congenital Abnormality</dd></dl></div></div></div>
<div class="spaceAbove">Anencephaly-2 (ANPH2) is a severe neural tube defect caused by failure of neural tube closure anteriorly. Features in addition to anencephaly may include frontonasal dysplasia with midline cleft of the upper lip and alveolar ridge, bifid nose, and clinical anophthalmia.&#13; For a discussion of genetic heterogeneity of anencephaly, see ANPH1 (206500).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1794155">Condition Record</a></div></div>
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<div class="portlet_head mgSectionHead ui-widget-header"><h1 class="nl" id="Professional_guidelines">Professional guidelines</h1><a sid="105" href="#" class="portlet_shutter" title="Show/hide content"></a></div>
<div class="portlet_content ln"><h3 class="subhead">PubMed<a class="help jig-ncbi-popper" data-jig="ncbipopper" href="#guidelinesHelpPM"><img class="pulldown" src="//static.pubmed.gov/portal/portal3rc.fcgi/4223267/img/4204968" /></a></h3>
<div class="nl"><a target="_blank" href="/pubmed/36882610">Neural tube defects: a review of global prevalence, causes, and primary prevention.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Kancherla V</span><br />
<span class="medgenPMjournal">Childs Nerv Syst</span>
2023 Jul;39(7):1703-1710.
Epub 2023 Mar 8
doi: 10.1007/s00381-023-05910-7.
<span class="bold">PMID: </span><a href="/pubmed/36882610" target="_blank">36882610</a></div>
<div class="nl"><a target="_blank" href="/pubmed/29189693">Practice Bulletin No. 187: Neural Tube Defects.</a></div>
<div class="portlet_content ln"><span class="medgenPMjournal">Obstet Gynecol</span>
2017 Dec;130(6):e279-e290.
doi: 10.1097/AOG.0000000000002412.
<span class="bold">PMID: </span><a href="/pubmed/29189693" target="_blank">29189693</a></div>
<div class="nl"><a target="_blank" href="/pubmed/25375307">RETIRED: Prenatal screening, diagnosis, and pregnancy management of fetal neural tube defects.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Wilson RD;
SOGC GENETICS COMMITTEE;
SPECIAL CONTRIBUTOR</span><br />
<span class="medgenPMjournal">J Obstet Gynaecol Can</span>
2014 Oct;36(10):927-939.
doi: 10.1016/S1701-2163(15)30444-8.
<span class="bold">PMID: </span><a href="/pubmed/25375307" target="_blank">25375307</a></div>
<div><a target="_blank" href="https://pubmed.ncbi.nlm.nih.gov/?term=(%22anencephaly%22%5Btiab%3A~0%5D)%20AND%20(%22english%20and%20humans%22%5BFilter%5D)%20AND%20(%20(%22practice%20guideline%22%5BFilter%5D)%20OR%20(practice*%5Btitl%5D%20AND%20(guideline%5Btitl%5D%20OR%20parameter%5Btitl%5D%20OR%20resource%5Btitl%5D%20OR%20bulletin%5Btitl%5D%20OR%20best%5Btitl%5D))%20OR%20(genetic*%5Btitl%5D%20AND%20(evaluation%5Btitl%5D%20OR%20counseling%5Btitl%5D%20OR%20screening%5Btitl%5D%20OR%20test*%5Btitl%5D))%20OR%20(clinical%5Btitl%5D%20AND%20((expert%5Btitl%5D%20AND%20consensus%5Btitl%5D)%20OR%20utility%5Btitl%5D%20OR%20guideline*%5Btitl%5D))%20OR%20(management%5Btitl%5D%20AND%20(clinical%5Btitl%5D%20OR%20diagnos*%5Btitl%5D%20OR%20recommendation%5Btitl%5D%20OR%20pain%5Btitl%5D%20OR%20surveillance%5Btitl%5D%20OR%20emergency%5Btitl%5D%20OR%20guideline*%5Btitl%5D%20OR%20therap*))%20OR%20(treatment%5Btitl%5D%20AND%20((evaluation%5Btitl%5D%20AND%20diagnosis%5Btitl%5D)%20OR%20(assessment%5Btitl%5D%20AND%20prevention%5Btitl%5D)%20OR%20therap*))%20OR%20(Diagnos*%5Btitl%5D%20AND%20(prenatal%5Btitl%5D%20OR%20treatment%5Btitl%5D%20OR%20follow-up%5Btitl%5D%20OR%20statement%5Btitl%5D%20OR%20criteria%5Btitl%5D%20OR%20newborn%5Btitl%5D%20OR%20differential%5Btitl%5D%20OR%20neonatal%5Btitl%5D%20OR%20neonate%5Btitl%5D))%20OR%20(guideline*%5Btitl%5D%20AND%20(pharmacogenetic*%5Btitl%5D%20OR%20recommendation%5Btitl%5D%20OR%20therap*%5Btitl%5D%20OR%20evidence-based%5Btitl%5D%20OR%20consensus%5Btitl%5D%20OR%20(technical%5Btitl%5D%20AND%20standard*%5Btitl%5D)%20OR%20(molecular%5Btitl%5D%20AND%20testing%5Btitl%5D)))%20OR%20(risk%5Btitl%5D%20AND%20assessment%5Btitl%5D)%20OR%20(recommendation*%5Btitl%5D%20AND%20(statement%5Btitl%5D%20OR%20Evidence-based%5Btitl%5D%20OR%20Consensus%5Btitl%5D))%20OR%20(care%20AND%20((Patient%5Btitl%5D%20AND%20standard*%5Btitl%5D)%20OR%20primary%5Btitl%5D%20OR%20psychosocial%5Btitl%5D))%20OR%20(Health%5Btitl%5D%20AND%20supervision%5Btitl%5D)%20OR%20(statement%5Btitl%5D%20AND%20(policy%5Btitl%5D%20OR%20position%5Btitl%5D%20OR%20Consensus%5Btitl%5D))%20OR%20(pharmacogenetics%5Btitl%5D%20AND%20(Dosing%5Btitl%5D%20OR%20therap*%5Btitl%5D%20OR%20genotype*%5Btitl%5D%20OR%20drug*%5Btitl%5D))%20OR%20(Chemotherapy%5Btitl%5D%20AND%20decision*%5Btitl%5D)%20OR%20(screening%5Btitl%5D%20AND%20(newborn%5Btitl%5D%20OR%20neonat*%5Btitl%5D%20OR%20detection%5Btitl%5D%20OR%20diagnos*%5Btitl%5D))%20OR%20(criteria%5Btitl%5D%20OR%20genotype*%5Btitl%5D)%20)%20NOT%20(%22Case%20reports%22%5BPublication%20type%5D%20OR%20%22clinical%20study%22%5BPublication%20Type%5D%20OR%20%22randomized%20controlled%20trial%22%5BPublication%20Type%5D)" title="PubMed search">See all (100)</a></div></div>
</div>
<div class="display-none help-popup" id="guidelinesHelpPM">These guidelines are articles in PubMed that match specific search criteria developed by MedGen to capture the most relevant practice guidelines. This list may not be comprehensive and may include broader topics as well. See the <a href="/medgen/docs/faq/" title="Frequently asked questions" target="_blank">FAQ</a> for details.</div><div class="display-none help-popup" id="guidelinesHelpCurated">These guidelines are manually curated by the MedGen team
to supplement articles available in PubMed. See the <a href="/medgen/docs/faq/" title="Frequently asked questions" target="_blank">FAQ</a> for details.</div>
<div class="portlet mgSection" id="ID_103">
<div class="portlet_head mgSectionHead ui-widget-header"><h1 class="nl" id="Recent_clinical_studies">Recent clinical studies</h1><a sid="103" href="#" class="portlet_shutter" title="Show/hide content"></a></div>
<div class="portlet_content ln"><h3 class="subhead">Etiology</h3>
<div class="nl"><a target="_blank" href="/pubmed/35470163">Prenatal diagnosis of craniorachischisis totalis.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Costa P,
Fontoura Oliveira A,
Baptista Vilaça A</span><br />
<span class="medgenPMjournal">BMJ Case Rep</span>
2022 Apr 25;15(4)
doi: 10.1136/bcr-2021-244682.
<span class="bold">PMID: </span><a href="/pubmed/35470163" target="_blank">35470163</a><a href="/pmc/articles/PMC9039352" target="_blank" class="PubMedFree">Free PMC Article</a></div>
<div class="nl"><a target="_blank" href="/pubmed/30421543">Overview on neural tube defects: From development to physical characteristics.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Avagliano L,
Massa V,
George TM,
Qureshy S,
Bulfamante GP,
Finnell RH</span><br />
<span class="medgenPMjournal">Birth Defects Res</span>
2019 Nov 15;111(19):1455-1467.
Epub 2018 Nov 12
doi: 10.1002/bdr2.1380.
<span class="bold">PMID: </span><a href="/pubmed/30421543" target="_blank">30421543</a><a href="/pmc/articles/PMC6511489" target="_blank" class="PubMedFree">Free PMC Article</a></div>
<div class="nl"><a target="_blank" href="/pubmed/25032496">Neural tube defects.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Greene ND,
Copp AJ</span><br />
<span class="medgenPMjournal">Annu Rev Neurosci</span>
2014;37:221-42.
doi: 10.1146/annurev-neuro-062012-170354.
<span class="bold">PMID: </span><a href="/pubmed/25032496" target="_blank">25032496</a><a href="/pmc/articles/PMC4486472" target="_blank" class="PubMedFree">Free PMC Article</a></div>
<div class="nl"><a target="_blank" href="/pubmed/2301360">Paternal occupation and anencephaly.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Brender JD,
Suarez L</span><br />
<span class="medgenPMjournal">Am J Epidemiol</span>
1990 Mar;131(3):517-21.
doi: 10.1093/oxfordjournals.aje.a115526.
<span class="bold">PMID: </span><a href="/pubmed/2301360" target="_blank">2301360</a></div>
<div class="nl"><a target="_blank" href="/pubmed/3066787">Personhood redux.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Willke JC,
Andrusko D</span><br />
<span class="medgenPMjournal">Hastings Cent Rep</span>
1988 Oct-Nov;18(5):30-3.
<span class="bold">PMID: </span><a href="/pubmed/3066787" target="_blank">3066787</a></div>
<div><a target="_blank" href="https://pubmed.ncbi.nlm.nih.gov/?term=%22Anencephaly%22%20AND%20Etiology%2Fbroad%5Bfilter%5D%20%20AND%20%22english%20and%20humans%22%5Bfilter%5D%20NOT%20comment%5BPTYP%5D%20NOT%20letter%5BPTYP%5D" title="PubMed search">See all (983)</a></div><h3 class="subhead">Diagnosis</h3>
<div class="nl"><a target="_blank" href="/pubmed/35470163">Prenatal diagnosis of craniorachischisis totalis.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Costa P,
Fontoura Oliveira A,
Baptista Vilaça A</span><br />
<span class="medgenPMjournal">BMJ Case Rep</span>
2022 Apr 25;15(4)
doi: 10.1136/bcr-2021-244682.
<span class="bold">PMID: </span><a href="/pubmed/35470163" target="_blank">35470163</a><a href="/pmc/articles/PMC9039352" target="_blank" class="PubMedFree">Free PMC Article</a></div>
<div class="nl"><a target="_blank" href="/pubmed/31986946">Craniorachischisis with Exencephaly.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Guerrero J,
Heller DS,
de Leon AB</span><br />
<span class="medgenPMjournal">Fetal Pediatr Pathol</span>
2021 Oct;40(5):501-504.
Epub 2020 Jan 27
doi: 10.1080/15513815.2020.1716282.
<span class="bold">PMID: </span><a href="/pubmed/31986946" target="_blank">31986946</a></div>
<div class="nl"><a target="_blank" href="/pubmed/33168213">Exencephaly-anencephaly Sequence.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Society for Maternal-Fetal Medicine,
Monteagudo A</span><br />
<span class="medgenPMjournal">Am J Obstet Gynecol</span>
2020 Dec;223(6):B5-B8.
Epub 2020 Nov 7
doi: 10.1016/j.ajog.2020.08.176.
<span class="bold">PMID: </span><a href="/pubmed/33168213" target="_blank">33168213</a></div>
<div class="nl"><a target="_blank" href="/pubmed/30421543">Overview on neural tube defects: From development to physical characteristics.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Avagliano L,
Massa V,
George TM,
Qureshy S,
Bulfamante GP,
Finnell RH</span><br />
<span class="medgenPMjournal">Birth Defects Res</span>
2019 Nov 15;111(19):1455-1467.
Epub 2018 Nov 12
doi: 10.1002/bdr2.1380.
<span class="bold">PMID: </span><a href="/pubmed/30421543" target="_blank">30421543</a><a href="/pmc/articles/PMC6511489" target="_blank" class="PubMedFree">Free PMC Article</a></div>
<div class="nl"><a target="_blank" href="/pubmed/828460">Cebo-anancephaly.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Chaurasia BD,
Dharker SR</span><br />
<span class="medgenPMjournal">Anat Anz</span>
1976;140(5):514-9.
<span class="bold">PMID: </span><a href="/pubmed/828460" target="_blank">828460</a></div>
<div><a target="_blank" href="https://pubmed.ncbi.nlm.nih.gov/?term=%22Anencephaly%22%20AND%20Diagnosis%2Fbroad%5Bfilter%5D%20%20AND%20%22english%20and%20humans%22%5Bfilter%5D%20NOT%20comment%5BPTYP%5D%20NOT%20letter%5BPTYP%5D" title="PubMed search">See all (931)</a></div><h3 class="subhead">Therapy</h3>
<div class="nl"><a target="_blank" href="/pubmed/36882610">Neural tube defects: a review of global prevalence, causes, and primary prevention.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Kancherla V</span><br />
<span class="medgenPMjournal">Childs Nerv Syst</span>
2023 Jul;39(7):1703-1710.
Epub 2023 Mar 8
doi: 10.1007/s00381-023-05910-7.
<span class="bold">PMID: </span><a href="/pubmed/36882610" target="_blank">36882610</a></div>
<div class="nl"><a target="_blank" href="/pubmed/28295633">Neural tube closure and embryonic metabolism.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Yamaguchi Y,
Miyazawa H,
Miura M</span><br />
<span class="medgenPMjournal">Congenit Anom (Kyoto)</span>
2017 Sep;57(5):134-137.
Epub 2017 May 31
doi: 10.1111/cga.12219.
<span class="bold">PMID: </span><a href="/pubmed/28295633" target="_blank">28295633</a></div>
<div class="nl"><a target="_blank" href="/pubmed/25032496">Neural tube defects.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Greene ND,
Copp AJ</span><br />
<span class="medgenPMjournal">Annu Rev Neurosci</span>
2014;37:221-42.
doi: 10.1146/annurev-neuro-062012-170354.
<span class="bold">PMID: </span><a href="/pubmed/25032496" target="_blank">25032496</a><a href="/pmc/articles/PMC4486472" target="_blank" class="PubMedFree">Free PMC Article</a></div>
<div class="nl"><a target="_blank" href="/pubmed/23790957">Neural tube defects: recent advances, unsolved questions, and controversies.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Copp AJ,
Stanier P,
Greene ND</span><br />
<span class="medgenPMjournal">Lancet Neurol</span>
2013 Aug;12(8):799-810.
Epub 2013 Jun 19
doi: 10.1016/S1474-4422(13)70110-8.
<span class="bold">PMID: </span><a href="/pubmed/23790957" target="_blank">23790957</a><a href="/pmc/articles/PMC4023229" target="_blank" class="PubMedFree">Free PMC Article</a></div>
<div class="nl"><a target="_blank" href="/pubmed/1677062">Prevention of neural tube defects: results of the Medical Research Council Vitamin Study. MRC Vitamin Study Research Group.</a></div>
<div class="portlet_content ln"><span class="medgenPMjournal">Lancet</span>
1991 Jul 20;338(8760):131-7.
<span class="bold">PMID: </span><a href="/pubmed/1677062" target="_blank">1677062</a></div>
<div><a target="_blank" href="https://pubmed.ncbi.nlm.nih.gov/?term=%22Anencephaly%22%20AND%20Therapy%2Fbroad%5Bfilter%5D%20%20AND%20%22english%20and%20humans%22%5Bfilter%5D%20NOT%20comment%5BPTYP%5D%20NOT%20letter%5BPTYP%5D" title="PubMed search">See all (432)</a></div><h3 class="subhead">Prognosis</h3>
<div class="nl"><a target="_blank" href="/pubmed/30421543">Overview on neural tube defects: From development to physical characteristics.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Avagliano L,
Massa V,
George TM,
Qureshy S,
Bulfamante GP,
Finnell RH</span><br />
<span class="medgenPMjournal">Birth Defects Res</span>
2019 Nov 15;111(19):1455-1467.
Epub 2018 Nov 12
doi: 10.1002/bdr2.1380.
<span class="bold">PMID: </span><a href="/pubmed/30421543" target="_blank">30421543</a><a href="/pmc/articles/PMC6511489" target="_blank" class="PubMedFree">Free PMC Article</a></div>
<div class="nl"><a target="_blank" href="/pubmed/26272218">Folic acid supplementation for pregnant women and those planning pregnancy: 2015 update.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Chitayat D,
Matsui D,
Amitai Y,
Kennedy D,
Vohra S,
Rieder M,
Koren G</span><br />
<span class="medgenPMjournal">J Clin Pharmacol</span>
2016 Feb;56(2):170-5.
Epub 2015 Nov 5
doi: 10.1002/jcph.616.
<span class="bold">PMID: </span><a href="/pubmed/26272218" target="_blank">26272218</a><a href="/pmc/articles/PMC4738404" target="_blank" class="PubMedFree">Free PMC Article</a></div>
<div class="nl"><a target="_blank" href="/pubmed/17513938">Trial of vaginal breech delivery: current role.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Yamamura Y,
Ramin KD,
Ramin SM</span><br />
<span class="medgenPMjournal">Clin Obstet Gynecol</span>
2007 Jun;50(2):526-36.
doi: 10.1097/GRF.0b013e31804c9d24.
<span class="bold">PMID: </span><a href="/pubmed/17513938" target="_blank">17513938</a></div>
<div class="nl"><a target="_blank" href="/pubmed/15292644">Meroacrania.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Tubbs RS,
Blount JP</span><br />
<span class="medgenPMjournal">Pediatr Neurosurg</span>
2004 Mar-Apr;40(2):95-6.
doi: 10.1159/000078919.
<span class="bold">PMID: </span><a href="/pubmed/15292644" target="_blank">15292644</a></div>
<div class="nl"><a target="_blank" href="/pubmed/3066785">Anencephaly: selected medical aspects.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Shewmon DA</span><br />
<span class="medgenPMjournal">Hastings Cent Rep</span>
1988 Oct-Nov;18(5):11-9.
<span class="bold">PMID: </span><a href="/pubmed/3066785" target="_blank">3066785</a></div>
<div><a target="_blank" href="https://pubmed.ncbi.nlm.nih.gov/?term=%22Anencephaly%22%20AND%20Prognosis%2Fbroad%5Bfilter%5D%20%20AND%20%22english%20and%20humans%22%5Bfilter%5D%20NOT%20comment%5BPTYP%5D%20NOT%20letter%5BPTYP%5D" title="PubMed search">See all (350)</a></div><h3 class="subhead">Clinical prediction guides</h3>
<div class="nl"><a target="_blank" href="/pubmed/38277408">National population-based estimates for major birth defects, 2016-2020.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Stallings EB,
Isenburg JL,
Rutkowski RE,
Kirby RS,
Nembhard WN,
Sandidge T,
Villavicencio S,
Nguyen HH,
McMahon DM,
Nestoridi E,
Pabst LJ;
National Birth Defects Prevention Network</span><br />
<span class="medgenPMjournal">Birth Defects Res</span>
2024 Jan;116(1):e2301.
doi: 10.1002/bdr2.2301.
<span class="bold">PMID: </span><a href="/pubmed/38277408" target="_blank">38277408</a><a href="/pmc/articles/PMC10898112" target="_blank" class="PubMedFree">Free PMC Article</a></div>
<div class="nl"><a target="_blank" href="/pubmed/32423763">Closing in on Mechanisms of Open Neural Tube Defects.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Lee S,
Gleeson JG</span><br />
<span class="medgenPMjournal">Trends Neurosci</span>
2020 Jul;43(7):519-532.
Epub 2020 May 15
doi: 10.1016/j.tins.2020.04.009.
<span class="bold">PMID: </span><a href="/pubmed/32423763" target="_blank">32423763</a><a href="/pmc/articles/PMC7321880" target="_blank" class="PubMedFree">Free PMC Article</a></div>
<div class="nl"><a target="_blank" href="/pubmed/31580536">National population-based estimates for major birth defects, 2010-2014.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Mai CT,
Isenburg JL,
Canfield MA,
Meyer RE,
Correa A,
Alverson CJ,
Lupo PJ,
Riehle-Colarusso T,
Cho SJ,
Aggarwal D,
Kirby RS;
National Birth Defects Prevention Network</span><br />
<span class="medgenPMjournal">Birth Defects Res</span>
2019 Nov 1;111(18):1420-1435.
Epub 2019 Oct 3
doi: 10.1002/bdr2.1589.
<span class="bold">PMID: </span><a href="/pubmed/31580536" target="_blank">31580536</a><a href="/pmc/articles/PMC7203968" target="_blank" class="PubMedFree">Free PMC Article</a></div>
<div class="nl"><a target="_blank" href="/pubmed/26272218">Folic acid supplementation for pregnant women and those planning pregnancy: 2015 update.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Chitayat D,
Matsui D,
Amitai Y,
Kennedy D,
Vohra S,
Rieder M,
Koren G</span><br />
<span class="medgenPMjournal">J Clin Pharmacol</span>
2016 Feb;56(2):170-5.
Epub 2015 Nov 5
doi: 10.1002/jcph.616.
<span class="bold">PMID: </span><a href="/pubmed/26272218" target="_blank">26272218</a><a href="/pmc/articles/PMC4738404" target="_blank" class="PubMedFree">Free PMC Article</a></div>
<div class="nl"><a target="_blank" href="/pubmed/19301349">Prenatal screening and diagnosis of neural tube defects.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Cameron M,
Moran P</span><br />
<span class="medgenPMjournal">Prenat Diagn</span>
2009 Apr;29(4):402-11.
doi: 10.1002/pd.2250.
<span class="bold">PMID: </span><a href="/pubmed/19301349" target="_blank">19301349</a></div>
<div><a target="_blank" href="https://pubmed.ncbi.nlm.nih.gov/?term=%22Anencephaly%22%20AND%20Clinical%20prediction%20guides%2Fbroad%5Bfilter%5D%20%20AND%20%22english%20and%20humans%22%5Bfilter%5D%20NOT%20comment%5BPTYP%5D%20NOT%20letter%5BPTYP%5D" title="PubMed search">See all (424)</a></div></div>
</div>
<div class="portlet mgSection" id="ID_104">
<div class="portlet_head mgSectionHead ui-widget-header"><h1 class="nl" id="Recent_systematic_reviews">Recent systematic reviews</h1><a sid="104" href="#" class="portlet_shutter" title="Show/hide content"></a></div>
<div class="portlet_content ln">
<div class="nl"><a target="_blank" href="/pubmed/37940152">Birth prevalence and risk factors of neural tube defects in Ethiopia: a systematic review and meta-analysis.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Tesfay N,
Hailu G,
Habtetsion M,
Woldeyohannes F</span><br />
<span class="medgenPMjournal">BMJ Open</span>
2023 Nov 7;13(11):e077685.
doi: 10.1136/bmjopen-2023-077685.
<span class="bold">PMID: </span><a href="/pubmed/37940152" target="_blank">37940152</a><a href="/pmc/articles/PMC10632862" target="_blank" class="PubMedFree">Free PMC Article</a></div>
<div class="nl"><a target="_blank" href="/pubmed/36253858">Global prevalence of congenital anencephaly: a comprehensive systematic review and meta-analysis.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Salari N,
Fatahi B,
Fatahian R,
Mohammadi P,
Rahmani A,
Darvishi N,
Keivan M,
Shohaimi S,
Mohammadi M</span><br />
<span class="medgenPMjournal">Reprod Health</span>
2022 Oct 17;19(1):201.
doi: 10.1186/s12978-022-01509-4.
<span class="bold">PMID: </span><a href="/pubmed/36253858" target="_blank">36253858</a><a href="/pmc/articles/PMC9575217" target="_blank" class="PubMedFree">Free PMC Article</a></div>
<div class="nl"><a target="_blank" href="/pubmed/34887455">Prevalence of anencephaly in Africa: a systematic review and meta-analysis.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Oumer M,
Kibret AA,
Girma A,
Tazebew A,
Silamsaw M</span><br />
<span class="medgenPMjournal">Sci Rep</span>
2021 Dec 9;11(1):23707.
doi: 10.1038/s41598-021-02966-w.
<span class="bold">PMID: </span><a href="/pubmed/34887455" target="_blank">34887455</a><a href="/pmc/articles/PMC8660872" target="_blank" class="PubMedFree">Free PMC Article</a></div>
<div class="nl"><a target="_blank" href="/pubmed/34126936">Magnitude and determinants of neural tube defect in Africa: a systematic review and meta-analysis.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Atlaw D,
Tekalegn Y,
Sahiledengle B,
Seyoum K,
Solomon D,
Gezahegn H,
Tariku Z,
Tekle Y,
Chattu VK</span><br />
<span class="medgenPMjournal">BMC Pregnancy Childbirth</span>
2021 Jun 14;21(1):426.
doi: 10.1186/s12884-021-03848-9.
<span class="bold">PMID: </span><a href="/pubmed/34126936" target="_blank">34126936</a><a href="/pmc/articles/PMC8204447" target="_blank" class="PubMedFree">Free PMC Article</a></div>
<div class="nl"><a target="_blank" href="/pubmed/29801440">A national estimate of the birth prevalence of congenital anomalies in India: systematic review and meta-analysis.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Bhide P,
Kar A</span><br />
<span class="medgenPMjournal">BMC Pediatr</span>
2018 May 25;18(1):175.
doi: 10.1186/s12887-018-1149-0.
<span class="bold">PMID: </span><a href="/pubmed/29801440" target="_blank">29801440</a><a href="/pmc/articles/PMC5970488" target="_blank" class="PubMedFree">Free PMC Article</a></div>
<div><a target="_blank" href="https://pubmed.ncbi.nlm.nih.gov/?term=%22Anencephaly%22%20AND%20systematic%5Bsb%5D%20AND%20%22english%20and%20humans%22%5Bfilter%5D%20NOT%20comment%5BPTYP%5D%20NOT%20letter%5BPTYP%5D" title="PubMed search">See all (20)</a></div></div>
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<div class="portlet_content ln"><ul><li><a href="/gtr/tests?term=C0002902%5bDISCUI%5d&amp;filter=method%3A2%5F8" target="_blank">Deletion/duplication analysis (1)</a></li>
<li><a href="/gtr/tests?term=C0002902%5bDISCUI%5d&amp;filter=method%3A2%5F7" target="_blank">Sequence analysis of the entire coding region (1)</a></li>
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<div class="portlet_content ln"><ul><li><a href="https://www.omim.org/phenotypicSeries/PS206500" target="_blank">OMIM</a></li><li><a href="https://clinicaltrials.gov/search?cond=Anencephaly" target="_blank">ClinicalTrials.gov</a></li></ul></div>
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<div class="portlet_content ln"><ul class="a_poppers"><li><a target="_blank" href="https://pubmed.ncbi.nlm.nih.gov/?term=(%22anencephaly%22%5Btiab%3A~0%5D)%20AND%20(%22english%20and%20humans%22%5BFilter%5D)%20AND%20(%20(%22practice%20guideline%22%5BFilter%5D)%20OR%20(practice*%5Btitl%5D%20AND%20(guideline%5Btitl%5D%20OR%20parameter%5Btitl%5D%20OR%20resource%5Btitl%5D%20OR%20bulletin%5Btitl%5D%20OR%20best%5Btitl%5D))%20OR%20(genetic*%5Btitl%5D%20AND%20(evaluation%5Btitl%5D%20OR%20counseling%5Btitl%5D%20OR%20screening%5Btitl%5D%20OR%20test*%5Btitl%5D))%20OR%20(clinical%5Btitl%5D%20AND%20((expert%5Btitl%5D%20AND%20consensus%5Btitl%5D)%20OR%20utility%5Btitl%5D%20OR%20guideline*%5Btitl%5D))%20OR%20(management%5Btitl%5D%20AND%20(clinical%5Btitl%5D%20OR%20diagnos*%5Btitl%5D%20OR%20recommendation%5Btitl%5D%20OR%20pain%5Btitl%5D%20OR%20surveillance%5Btitl%5D%20OR%20emergency%5Btitl%5D%20OR%20guideline*%5Btitl%5D%20OR%20therap*))%20OR%20(treatment%5Btitl%5D%20AND%20((evaluation%5Btitl%5D%20AND%20diagnosis%5Btitl%5D)%20OR%20(assessment%5Btitl%5D%20AND%20prevention%5Btitl%5D)%20OR%20therap*))%20OR%20(Diagnos*%5Btitl%5D%20AND%20(prenatal%5Btitl%5D%20OR%20treatment%5Btitl%5D%20OR%20follow-up%5Btitl%5D%20OR%20statement%5Btitl%5D%20OR%20criteria%5Btitl%5D%20OR%20newborn%5Btitl%5D%20OR%20differential%5Btitl%5D%20OR%20neonatal%5Btitl%5D%20OR%20neonate%5Btitl%5D))%20OR%20(guideline*%5Btitl%5D%20AND%20(pharmacogenetic*%5Btitl%5D%20OR%20recommendation%5Btitl%5D%20OR%20therap*%5Btitl%5D%20OR%20evidence-based%5Btitl%5D%20OR%20consensus%5Btitl%5D%20OR%20(technical%5Btitl%5D%20AND%20standard*%5Btitl%5D)%20OR%20(molecular%5Btitl%5D%20AND%20testing%5Btitl%5D)))%20OR%20(risk%5Btitl%5D%20AND%20assessment%5Btitl%5D)%20OR%20(recommendation*%5Btitl%5D%20AND%20(statement%5Btitl%5D%20OR%20Evidence-based%5Btitl%5D%20OR%20Consensus%5Btitl%5D))%20OR%20(care%20AND%20((Patient%5Btitl%5D%20AND%20standard*%5Btitl%5D)%20OR%20primary%5Btitl%5D%20OR%20psychosocial%5Btitl%5D))%20OR%20(Health%5Btitl%5D%20AND%20supervision%5Btitl%5D)%20OR%20(statement%5Btitl%5D%20AND%20(policy%5Btitl%5D%20OR%20position%5Btitl%5D%20OR%20Consensus%5Btitl%5D))%20OR%20(pharmacogenetics%5Btitl%5D%20AND%20(Dosing%5Btitl%5D%20OR%20therap*%5Btitl%5D%20OR%20genotype*%5Btitl%5D%20OR%20drug*%5Btitl%5D))%20OR%20(Chemotherapy%5Btitl%5D%20AND%20decision*%5Btitl%5D)%20OR%20(screening%5Btitl%5D%20AND%20(newborn%5Btitl%5D%20OR%20neonat*%5Btitl%5D%20OR%20detection%5Btitl%5D%20OR%20diagnos*%5Btitl%5D))%20OR%20(criteria%5Btitl%5D%20OR%20genotype*%5Btitl%5D)%20)%20NOT%20(%22Case%20reports%22%5BPublication%20type%5D%20OR%20%22clinical%20study%22%5BPublication%20Type%5D%20OR%20%22randomized%20controlled%20trial%22%5BPublication%20Type%5D)" title="PubMed search">PubMed</a><div class="help-popup">See practice and clinical guidelines in PubMed. The search results may include broader topics and may not capture all published guidelines. See the <a href="/medgen/docs/faq/" title="Frequently asked questions" target="_blank">FAQ</a> for details.</div></li><li><a target="_blank" href="/books/?term=((%22clinical%20guidelines%22%5BResource%20Type%5D)%20OR%20%22practice%20guideline%22%5BPublication%20Type%5D)%20AND%20(%22Anencephaly%22)">Bookshelf</a><div class="help-popup">See practice and clinical guidelines in NCBI Bookshelf. The search results may include broader topics and may not capture all published guidelines. See the <a href="/medgen/docs/faq/" title="Frequently asked questions" target="_blank">FAQ</a> for details.</div></li></ul></div>
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