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<meta name="keywords" content="C4012727, disease or syndrome, meg-pmg-megacc syndrome, megalencephaly, mega corpus callosum, and complete lack of motor development, megalencephaly, polymicrogyria, mega corpus callosum syndrome, megalencephaly-polymicrogyria-polydactyly-hydrocephalus syndrome 1, megalencephaly-polymicrogyria-polydactyly-hydrocephalus syndrome type 1, megalencephaly-polymicrogyria-polydactyly-hydrocephalus syndrome-1, megalencephaly-polymicrogyria-postaxial polydactyly-hydrocephalus syndrome caused by mutation in pik3r2, mpph1, pik3r2, pik3r2 megalencephaly-polymicrogyria-postaxial polydactyly-hydrocephalus syndrome, 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="MPPH (megalencephaly-postaxial polydactyly-polymicrogyria-hydrocephalus) syndrome is a developmental brain disorder characterized by megalencephaly (brain overgrowth) with the cortical malformation bilateral perisylvian polymicrogyria (BPP). At birth the occipital frontal circumference (OFC) ranges from normal to 6 standard deviations (SD) above the mean for age, sex, and gestational age; in older individuals the range is from 3 to 10 SD above the mean. A variable degree of ventriculomegaly is seen in almost all children with MPPH syndrome; nearly 50% of individuals have frank hydrocephalus. Neurologic problems associated with BPP include oromotor dysfunction (100%), epilepsy (50%), and mild-to-severe intellectual disability (100%). Postaxial hexadactyly occurs in 50% of individuals with MPPH syndrome." /><meta name="robots" content="index,nofollow,noarchive" />
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<title>Megalencephaly-polymicrogyria-polydactyly-hydrocephalus syndrome 1 (Concept Id: C4012727)
- MedGen - NCBI</title>
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<!--
UID=861164
ConceptID=C4012727
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<!--imgCountBooks = 0--><h1 class="medgenTitle"><div class="MedGenTitleText">Megalencephaly-polymicrogyria-polydactyly-hydrocephalus syndrome 1<span class="h1sub">(MPPH1)</span></div></h1><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>861164</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:">C4012727</span></a></dd><dt><span class="dotprefix"> •</span></dt><dd>Disease or Syndrome</dd></dl></div></div><table class="medgenTable"><tbody><tr><td>Synonyms:</td>
<td>MEGALENCEPHALY, MEGA CORPUS CALLOSUM, AND COMPLETE LACK OF MOTOR DEVELOPMENT; MEGALENCEPHALY, POLYMICROGYRIA, MEGA CORPUS CALLOSUM SYNDROME; MPPH1</td></tr>
<tr><td colspan="2" class="small"> </td></tr><tr><td><a class="help jig-ncbi-popper" data-jig="ncbipopper" href="#target-gene-loc">Gene (location):<img class="pulldown" src="//static.pubmed.gov/portal/portal3rc.fcgi/4223267/img/4204968" /></a><div class="display-none" id="target-gene-loc">
Gene(s) directly associated with<br />
this condition or phenotype.</div></td>
<td><a target="_blank" title="PIK3R2 - ID: 5296 - NCBI Gene" href="/gene/5296" class="medgenPMinfo">PIK3R2</a> (19p13.11)</td></tr>
<tr><td colspan="2" class="small"> </td></tr><tr><td>Monarch Initiative:</td>
<td><a href="https://monarchinitiative.org/disease/MONDO:0011313" target="_blank">MONDO:0011313</a></td></tr>
<tr><td>OMIM<span class="superscript">®</span>:</td>
<td><a href="https://omim.org/entry/603387" target="_blank">603387</a></td></tr>
</tbody></table></div><div class="rprt-body jig-ncbiinpagenav" data-jigconfig="smoothScroll: false, gotoTopLink: true, gotoTopLinkText: '', gotoTopLinkAttrs: {'title': 'Go to the top of the page'},allHeadingLevels: ['h1'], topOfPageTOC: true, tocId: 'my-toc'"><div id="rprt-tabs-1" class="rprt-tab"><div id="tb-termsProp-1"><div class="leftCol mgCol"><div>
<div class="portlet mgSection" id="ID_101">
<div class="portlet_head mgSectionHead ui-widget-header"><h1 class="nl" id="Disease_characteristics">Disease characteristics</h1><a sid="101" href="#" class="portlet_shutter" title="Show/hide content"></a></div>
<div class="portlet_content ln"><div class="excerpt">Excerpted from the <i>GeneReview: </i><a href="/books/NBK396098" target="_blank">MPPH Syndrome</a></div><div>MPPH (megalencephaly-postaxial polydactyly-polymicrogyria-hydrocephalus) syndrome is a developmental brain disorder characterized by megalencephaly (brain overgrowth) with the cortical malformation bilateral perisylvian polymicrogyria (BPP). At birth the occipital frontal circumference (OFC) ranges from normal to 6 standard deviations (SD) above the mean for age, sex, and gestational age; in older individuals the range is from 3 to 10 SD above the mean. A variable degree of ventriculomegaly is seen in almost all children with MPPH syndrome; nearly 50% of individuals have frank hydrocephalus. Neurologic problems associated with BPP include oromotor dysfunction (100%), epilepsy (50%), and mild-to-severe intellectual disability (100%). Postaxial hexadactyly occurs in 50% of individuals with MPPH syndrome. [from <a title="GeneReviews" href="https://www.ncbi.nlm.nih.gov/books/NBK1116" class="defSource" target="_blank">GeneReviews</a>]</div><div class="spaceAbove"><strong>Full text of <i>GeneReview</i> (by section):</strong><br /><a class="medgenPMinfo" href="/books/NBK396098#mpph.Summary" target="NBK396098">Summary</a>  |  <a class="medgenPMinfo" href="/books/NBK396098#mpph.Diagnosis" target="NBK396098">Diagnosis</a>  |  <a class="medgenPMinfo" href="/books/NBK396098#mpph.Clinical_Characteristics" target="NBK396098">Clinical Characteristics</a>  |  <a class="medgenPMinfo" href="/books/NBK396098#mpph.Genetically_Related_Allelic_Disorde" target="NBK396098">Genetically Related (Allelic) Disorders</a>  |  <a class="medgenPMinfo" href="/books/NBK396098#mpph.Differential_Diagnosis" target="NBK396098">Differential Diagnosis</a>  |  <a class="medgenPMinfo" href="/books/NBK396098#mpph.Management" target="NBK396098">Management</a>  |  <a class="medgenPMinfo" href="/books/NBK396098#mpph.Genetic_Counseling" target="NBK396098">Genetic Counseling</a>  |  <a class="medgenPMinfo" href="/books/NBK396098#mpph.Resources" target="NBK396098">Resources</a>  |  <a class="medgenPMinfo" href="/books/NBK396098#mpph.Molecular_Genetics" target="NBK396098">Molecular Genetics</a>  |  <a class="medgenPMinfo" href="/books/NBK396098#mpph.Chapter_Notes" target="NBK396098">Chapter Notes</a>  |  <a class="medgenPMinfo" href="/books/NBK396098#mpph.References" target="NBK396098">References</a></div><div class="spaceAbove"><strong>Authors:</strong><br />
Ghayda Mirzaa   <a href="/books/NBK396098" target="NBK396098" title="NCBI Bookshelf: MPPH Syndrome">view full author information</a></div></div>
</div>
<div class="portlet mgSection" id="ID_117">
<div class="portlet_head mgSectionHead ui-widget-header"><h1 class="nl" id="Additional_description">Additional description</h1><a sid="117" href="#" class="portlet_shutter" title="Show/hide content"></a></div>
<div class="portlet_content ln"><div class="mgSection"><strong>From MedlinePlus Genetics</strong><br />Megalencephaly-polymicrogyria-polydactyly-hydrocephalus (MPPH) syndrome is a rare disorder that primarily affects the development of the brain. Affected individuals are born with an unusually large brain and head size (megalencephaly). The head and brain continue to grow rapidly during the first 2 years of life. MPPH syndrome is also associated with a brain abnormality called bilateral perisylvian polymicrogyria (BPP). The surface of the brain normally has many ridges or folds, called gyri. In people with BPP, an area of the brain called the perisylvian region develops too many gyri, and the folds are irregular and unusually small. Other brain abnormalities, including a buildup of fluid in the brain (hydrocephalus), have also been reported in people with MPPH syndrome.<br /><br />The brain abnormalities characteristic of MPPH syndrome are also found in a closely related condition called megalencephaly-capillary malformation syndrome (MCAP). However, MCAP includes abnormalities of small blood vessels in the skin (capillary malformations) and several other features that are not usually part of MPPH syndrome.<br /><br />The problems with brain development cause a variety of neurological signs and symptoms. People with MPPH syndrome have delayed development and intellectual disability that ranges from mild to severe. About half of affected individuals develop recurrent seizures (epilepsy) beginning early in childhood. People with MPPH syndrome also have difficulty coordinating movements of the mouth and tongue (known as oromotor dysfunction), which leads to drooling, difficulty swallowing (dysphagia), and a delay in the production of speech (expressive language).<br /><br />About half of people with MPPH syndrome have an extra finger or toe on one or more of their hands or feet (polydactyly). The polydactyly is described as postaxial because it occurs on the same side of the hand or foot as the pinky finger or little toe.  <a target="_blank" href="https://medlineplus.gov/genetics/condition/megalencephaly-polymicrogyria-polydactyly-hydrocephalus-syndrome">https://medlineplus.gov/genetics/condition/megalencephaly-polymicrogyria-polydactyly-hydrocephalus-syndrome</a></div></div>
</div>
<div class="portlet mgSection" id="ID_102">
<div class="portlet_head mgSectionHead ui-widget-header"><h1 class="nl" id="Clinical_features">Clinical features</h1><a sid="102" href="#" class="portlet_shutter" title="Show/hide content"></a></div>
<div class="portlet_content ln clinfeat"><strong>From HPO</strong><br />
<div class="divPopper rprt" id="clin_67394"><div><strong>Postaxial polydactyly</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>67394</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.">C0220697</a></dd><dt><span class="dotprefix"> •</span></dt><dd>Congenital Abnormality</dd></dl></div></div></div>
<div class="spaceAbove">Polydactyly refers to the occurrence of supernumerary digits and is the most frequent of congenital hand and foot deformities. Based on the location of the extra digits, polydactyly can be classified into preaxial, involving the thumb or great toe; postaxial, affecting the fifth digit; and central, involving the 3 central digits. Postaxial polydactyly (PAP) is further subclassified into 2 types: in type A, a well-formed extra digit articulates with the fifth or a sixth metacarpal, whereas in type B, a rudimentary, poorly developed extra digit is present (summary by Umm-e-Kalsoom et al., 2012).&#13; Genetic Heterogeneity of Postaxial Polydactyly&#13; Other forms of postaxial polydactyly type A include PAPA2 (602085) on chromosome 13q21; PAPA3 (607324) on chromosome 19p13; PAPA4 (608562) on chromosome 7q22; PAPA5 (263450) on chromosome 13q13; PAPA6 (615226), caused by mutation in the ZNF141 gene (194648) on chromosome 4p16; PAPA7 (617642), caused by mutation in the IQCE gene (617631) on chromosome 7p22; PAPA8 (618123), caused by mutation in the GLI1 gene (165220) on chromosome 12q13; PAPA9 (618219), caused by mutation in the CIBAR1 gene (617273) on chromosome 8q22; and PAPA10 (618498), caused by mutation in the KIAA0825 gene (617266) on chromosome 5q15.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/67394">Feature record</a> | <a href="/medgen?term=%22Postaxial%20polydactyly%22%5BClinical%20Features%5D%20OR%2067394%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_98042"><div><strong>Knee flexion contracture</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>98042</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.">C0409355</a></dd><dt><span class="dotprefix"> •</span></dt><dd>Finding</dd></dl></div></div></div>
<div class="spaceAbove">A type of knee joint contracture in which the knee is in a fixed bent (flexed) configuration such that it cannot be straightened actively or passively.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/98042">Feature record</a> | <a href="/medgen?term=%22Knee%20flexion%20contracture%22%5BClinical%20Features%5D%20OR%2098042%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_6753"><div><strong>Atrial septal defect</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>6753</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.">C0018817</a></dd><dt><span class="dotprefix"> •</span></dt><dd>Congenital Abnormality</dd></dl></div></div></div>
<div class="spaceAbove">Atrial septal defect (ASD) is a congenital abnormality of the interatrial septum that enables blood flow between the left and right atria via the interatrial septum.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/6753">Feature record</a> | <a href="/medgen?term=%22Atrial%20septal%20defect%22%5BClinical%20Features%5D%20OR%206753%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_42366"><div><strong>Ventricular septal defect</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>42366</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.">C0018818</a></dd><dt><span class="dotprefix"> •</span></dt><dd>Congenital Abnormality</dd></dl></div></div></div>
<div class="spaceAbove">A hole between the two bottom chambers (ventricles) of the heart. The defect is centered around the most superior aspect of the ventricular septum.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/42366">Feature record</a> | <a href="/medgen?term=%22Ventricular%20septal%20defect%22%5BClinical%20Features%5D%20OR%2042366%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_7670"><div><strong>Mitral regurgitation</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>7670</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.">C0026266</a></dd><dt><span class="dotprefix"> •</span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">An abnormality of the mitral valve characterized by insufficiency or incompetence of the mitral valve resulting in retrograde leaking of blood through the mitral valve upon ventricular contraction.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/7670">Feature record</a> | <a href="/medgen?term=%22Mitral%20regurgitation%22%5BClinical%20Features%5D%20OR%207670%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_65131"><div><strong>Vascular ring</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>65131</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.">C0221214</a></dd><dt><span class="dotprefix"> •</span></dt><dd>Congenital Abnormality</dd></dl></div></div></div>
<div class="spaceAbove">A developmental defect of the aortic arch system in which the trachea and esophagus are completely encircled by connected segments of the aortic arch and its branches. This occurs if the normal process of regression and persistence of the bilateral embryonic aortic arches fails.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/65131">Feature record</a> | <a href="/medgen?term=%22Vascular%20ring%22%5BClinical%20Features%5D%20OR%2065131%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_376550"><div><strong>Overgrowth</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>376550</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.">C1849265</a></dd><dt><span class="dotprefix"> •</span></dt><dd>Finding</dd></dl></div></div></div>
<div class="spaceAbove">Excessive postnatal growth which may comprise increased weight, increased length, and/or increased head circumference.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/376550">Feature record</a> | <a href="/medgen?term=%22Overgrowth%22%5BClinical%20Features%5D%20OR%20376550%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_9335"><div><strong>Hydrocephalus</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>9335</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.">C0020255</a></dd><dt><span class="dotprefix"> •</span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Hydrocephalus is an active distension of the ventricular system of the brain resulting from inadequate passage of CSF from its point of production within the cerebral ventricles to its point of absorption into the systemic circulation.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/9335">Feature record</a> | <a href="/medgen?term=%22Hydrocephalus%22%5BClinical%20Features%5D%20OR%209335%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_20693"><div><strong>Seizure</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>20693</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.">C0036572</a></dd><dt><span class="dotprefix"> •</span></dt><dd>Sign or Symptom</dd></dl></div></div></div>
<div class="spaceAbove">A seizure is an intermittent abnormality of nervous system physiology characterized by a transient occurrence of signs and/or symptoms due to abnormal excessive or synchronous neuronal activity in the brain.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/20693">Feature record</a> | <a href="/medgen?term=%22Seizure%22%5BClinical%20Features%5D%20OR%2020693%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_65141"><div><strong>Megalencephaly</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>65141</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.">C0221355</a></dd><dt><span class="dotprefix"> •</span></dt><dd>Congenital Abnormality</dd></dl></div></div></div>
<div class="spaceAbove">Diffuse enlargement of the entire cerebral hemispheres leading to macrocephaly (with or without overlying cortical dysplasia).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/65141">Feature record</a> | <a href="/medgen?term=%22Megalencephaly%22%5BClinical%20Features%5D%20OR%2065141%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_78605"><div><strong>Polymicrogyria</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>78605</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.">C0266464</a></dd><dt><span class="dotprefix"> •</span></dt><dd>Congenital Abnormality</dd></dl></div></div></div>
<div class="spaceAbove">Polymicrogyria is a congenital malformation of the cerebral cortex characterized by abnormal cortical layering (lamination) and an excessive number of small gyri (folds).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/78605">Feature record</a> | <a href="/medgen?term=%22Polymicrogyria%22%5BClinical%20Features%5D%20OR%2078605%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_120579"><div><strong>Macrogyria</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>120579</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.">C0266483</a></dd><dt><span class="dotprefix"> •</span></dt><dd>Congenital Abnormality</dd></dl></div></div></div>
<div class="spaceAbove">Pachygyria is a malformation of cortical development with abnormally wide gyri with sulci 1,5-3 cm apart and abnormally thick cortex measuring more than 5 mm (radiological definition). See also neuropathological definitions for 2-, 3-, and 4-layered lissencephaly.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/120579">Feature record</a> | <a href="/medgen?term=%22Macrogyria%22%5BClinical%20Features%5D%20OR%20120579%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_138005"><div><strong>Hypoplasia of the corpus callosum</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>138005</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.">C0344482</a></dd><dt><span class="dotprefix"> •</span></dt><dd>Congenital Abnormality</dd></dl></div></div></div>
<div class="spaceAbove">Underdevelopment of the corpus callosum.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/138005">Feature record</a> | <a href="/medgen?term=%22Hypoplasia%20of%20the%20corpus%20callosum%22%5BClinical%20Features%5D%20OR%20138005%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_107838"><div><strong>Global developmental delay</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>107838</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.">C0557874</a></dd><dt><span class="dotprefix"> •</span></dt><dd>Finding</dd></dl></div></div></div>
<div class="spaceAbove">A delay in the achievement of motor or mental milestones in the domains of development of a child, including motor skills, speech and language, cognitive skills, and social and emotional skills. This term should only be used to describe children younger than five years of age.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/107838">Feature record</a> | <a href="/medgen?term=%22Global%20developmental%20delay%22%5BClinical%20Features%5D%20OR%20107838%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_371993"><div><strong>Thick corpus callosum</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>371993</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.">C1835194</a></dd><dt><span class="dotprefix"> •</span></dt><dd>Finding</dd></dl></div></div></div>
<div class="spaceAbove">Increased vertical dimension of the corpus callosum. This feature can be visualized by sagittal sections on magnetic resonance tomography imaging of the brain.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/371993">Feature record</a> | <a href="/medgen?term=%22Thick%20corpus%20callosum%22%5BClinical%20Features%5D%20OR%20371993%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_892508"><div><strong>Intellectual disability, profound</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>892508</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.">C3161330</a></dd><dt><span class="dotprefix"> •</span></dt><dd>Mental or Behavioral Dysfunction</dd></dl></div></div></div>
<div class="spaceAbove">Profound mental retardation is defined as an intelligence quotient (IQ) below 20.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/892508">Feature record</a> | <a href="/medgen?term=%22Intellectual%20disability%2C%20profound%22%5BClinical%20Features%5D%20OR%20892508%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_480553"><div><strong>Ventriculomegaly</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>480553</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.">C3278923</a></dd><dt><span class="dotprefix"> •</span></dt><dd>Finding</dd></dl></div></div></div>
<div class="spaceAbove">An increase in size of the ventricular system of the brain.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/480553">Feature record</a> | <a href="/medgen?term=%22Ventriculomegaly%22%5BClinical%20Features%5D%20OR%20480553%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_44042"><div><strong>Kyphosis</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>44042</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.">C0022821</a></dd><dt><span class="dotprefix"> •</span></dt><dd>Anatomical Abnormality</dd></dl></div></div></div>
<div class="spaceAbove">Exaggerated anterior convexity of the thoracic vertebral column.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/44042">Feature record</a> | <a href="/medgen?term=%22Kyphosis%22%5BClinical%20Features%5D%20OR%2044042%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_67453"><div><strong>Frontal bossing</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>67453</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.">C0221354</a></dd><dt><span class="dotprefix"> •</span></dt><dd>Congenital Abnormality</dd></dl></div></div></div>
<div class="spaceAbove">Bilateral bulging of the lateral frontal bone prominences with relative sparing of the midline.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/67453">Feature record</a> | <a href="/medgen?term=%22Frontal%20bossing%22%5BClinical%20Features%5D%20OR%2067453%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_892680"><div><strong>Muscular atrophy</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>892680</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.">C0541794</a></dd><dt><span class="dotprefix"> •</span></dt><dd>Pathologic Function</dd></dl></div></div></div>
<div class="spaceAbove">The presence of skeletal muscular atrophy (which is also known as amyotrophy).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/892680">Feature record</a> | <a href="/medgen?term=%22Muscular%20atrophy%22%5BClinical%20Features%5D%20OR%20892680%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_342959"><div><strong>Axial hypotonia</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>342959</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.">C1853743</a></dd><dt><span class="dotprefix"> •</span></dt><dd>Finding</dd></dl></div></div></div>
<div class="spaceAbove">Muscular hypotonia (abnormally low muscle tone) affecting the musculature of the trunk.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/342959">Feature record</a> | <a href="/medgen?term=%22Axial%20hypotonia%22%5BClinical%20Features%5D%20OR%20342959%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_387910"><div><strong>Thoracic scoliosis</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>387910</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.">C1857790</a></dd><dt><span class="dotprefix"> •</span></dt><dd>Anatomical Abnormality</dd></dl></div></div></div>
<div class="spaceAbove nowrap">See: <a href="/medgen/387910">Feature record</a> | <a href="/medgen?term=%22Thoracic%20scoliosis%22%5BClinical%20Features%5D%20OR%20387910%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_745757"><div><strong>Macrocephaly</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>745757</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.">C2243051</a></dd><dt><span class="dotprefix"> •</span></dt><dd>Finding</dd></dl></div></div></div>
<div class="spaceAbove">Occipitofrontal (head) circumference greater than 97th centile compared to appropriate, age matched, sex-matched normal standards. Alternatively, a apparently increased size of the cranium.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/745757">Feature record</a> | <a href="/medgen?term=%22Macrocephaly%22%5BClinical%20Features%5D%20OR%20745757%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_340300"><div><strong>Long palpebral fissure</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>340300</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.">C1849340</a></dd><dt><span class="dotprefix"> •</span></dt><dd>Finding</dd></dl></div></div></div>
<div class="spaceAbove">Distance between medial and lateral canthi is more than two standard deviations above the mean for age (objective); or, apparently increased length of the palpebral fissures.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/340300">Feature record</a> | <a href="/medgen?term=%22Long%20palpebral%20fissure%22%5BClinical%20Features%5D%20OR%20340300%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_2287"><div><strong>Ptosis</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>2287</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.">C0005745</a></dd><dt><span class="dotprefix"> •</span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">The upper eyelid margin is positioned 3 mm or more lower than usual and covers the superior portion of the iris (objective); or, the upper lid margin obscures at least part of the pupil (subjective).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/2287">Feature record</a> | <a href="/medgen?term=%22Ptosis%22%5BClinical%20Features%5D%20OR%202287%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_99138"><div><strong>Blindness</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>99138</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.">C0456909</a></dd><dt><span class="dotprefix"> •</span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Blindness is the condition of lacking visual perception defined as a profound reduction in visual perception. On the 6m visual acuity scale, blindness is defined as less than 3/60. On the 20ft visual acuity scale, blindness is defined as less than 20/400. On the decimal visual acuity scale, blindness is defined as less than 0.05. Blindness is typically characterized by a visual field of no greater than 10 degrees in radius around central fixation.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/99138">Feature record</a> | <a href="/medgen?term=%22Blindness%22%5BClinical%20Features%5D%20OR%2099138%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_344595"><div><strong>Abnormally large globe</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>344595</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.">C1855852</a></dd><dt><span class="dotprefix"> •</span></dt><dd>Finding</dd></dl></div></div></div>
<div class="spaceAbove">Diffusely large eye (with megalocornea) without glaucoma.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/344595">Feature record</a> | <a href="/medgen?term=%22Abnormally%20large%20globe%22%5BClinical%20Features%5D%20OR%20344595%5Buid%5D">Search on this feature</a></div></div><div class="TreeLite" data-jigconfig="closed: 1"><div class="concept-def"><a class="small" href="#" onclick="jQuery(&quot;.TreeLite&quot;,&quot;#ID_102&quot;).TreeLite().openAll(); return false;">Show all</a><a class="small" href="#" onclick="jQuery(&quot;.TreeLite&quot;,&quot;#ID_102&quot;).TreeLite().closeAll(); return false;">Hide all</a></div><ul><li><span class="TLline">Abnormality of head or neck</span><ul><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_340300" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Long palpebral fissure</a></span></li></ul></li><li><span class="TLline">Abnormality of limbs</span><ul><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_98042" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Knee flexion contracture</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_67394" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Postaxial polydactyly</a></span></li></ul></li><li><span class="TLline">Abnormality of the cardiovascular system</span><ul><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_6753" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Atrial septal defect</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_7670" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Mitral regurgitation</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_65131" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Vascular ring</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_42366" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Ventricular septal defect</a></span></li></ul></li><li><span class="TLline">Abnormality of the eye</span><ul><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_344595" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Abnormally large globe</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_99138" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Blindness</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_2287" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Ptosis</a></span></li></ul></li><li><span class="TLline">Abnormality of the musculoskeletal system</span><ul><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_342959" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Axial hypotonia</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_67453" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Frontal bossing</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_44042" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Kyphosis</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_745757" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Macrocephaly</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_892680" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Muscular atrophy</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_387910" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Thoracic scoliosis</a></span></li></ul></li><li><span class="TLline">Abnormality of the nervous system</span><ul><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_107838" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Global developmental delay</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_9335" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Hydrocephalus</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_138005" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Hypoplasia of the corpus callosum</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_892508" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Intellectual disability, profound</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_120579" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Macrogyria</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_65141" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Megalencephaly</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_78605" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Polymicrogyria</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_20693" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Seizure</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_371993" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Thick corpus callosum</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_480553" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Ventriculomegaly</a></span></li></ul></li><li><span class="TLline">Growth abnormality</span><ul><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_376550" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Overgrowth</a></span></li></ul></li></ul></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">Diagnosis</h3>
<div class="nl"><a target="_blank" href="/pubmed/33958329">The Fetus with Ganglionic Eminence Abnormality: Head Size and Extracranial Sonographic Findings Predict Genetic Diagnoses and Postnatal Outcomes.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Goergen SK,
Alibrahim E,
Christie J,
Dobrotwir A,
Fahey M,
Fender L,
Frawley K,
Manikkam SA,
Pinner JR,
Sinnott S,
Romaniello R,
Sandaradura SA,
Taylor J,
Vasudevan A,
Righini A</span><br />
<span class="medgenPMjournal">AJNR Am J Neuroradiol</span>
2021 Aug;42(8):1528-1534.
Epub 2021 May 6
doi: 10.3174/ajnr.A7131.
<span class="bold">PMID: </span><a href="/pubmed/33958329" target="_blank">33958329</a><a href="/pmc/articles/PMC8367629" target="_blank" class="PubMedFree">Free PMC Article</a></div>
<div class="nl"><a target="_blank" href="/pubmed/22859694">Megalencephaly-polymicrogyria-polydactyly-hydrocephalus syndrome: a case report.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Kariminejad A,
Radmanesh F,
Rezayi AR,
Tonekaboni SH,
Gleeson JG</span><br />
<span class="medgenPMjournal">J Child Neurol</span>
2013 May;28(5):651-7.
Epub 2012 Aug 1
doi: 10.1177/0883073812448530.
<span class="bold">PMID: </span><a href="/pubmed/22859694" target="_blank">22859694</a></div>
<div class="nl"><a target="_blank" href="/pubmed/19353582">Significant overlap and possible identity of macrocephaly capillary malformation and megalencephaly polymicrogyria-polydactyly hydrocephalus syndromes.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Gripp KW,
Hopkins E,
Vinkler C,
Lev D,
Malinger G,
Lerman-Sagie T,
Dobyns WB</span><br />
<span class="medgenPMjournal">Am J Med Genet A</span>
2009 May;149A(5):868-76.
doi: 10.1002/ajmg.a.32732.
<span class="bold">PMID: </span><a href="/pubmed/19353582" target="_blank">19353582</a></div>
<div><a target="_blank" href="https://pubmed.ncbi.nlm.nih.gov/?term=%22Megalencephaly-polymicrogyria-polydactyly-hydrocephalus%20syndrome%201%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 (3)</a></div><h3 class="subhead">Therapy</h3>
<div class="nl"><a target="_blank" href="/pubmed/25523067">Germline activating AKT3 mutation associated with megalencephaly, polymicrogyria, epilepsy and hypoglycemia.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Nellist M,
Schot R,
Hoogeveen-Westerveld M,
Neuteboom RF,
van der Louw EJ,
Lequin MH,
Bindels-de Heus K,
Sibbles BJ,
de Coo R,
Brooks A,
Mancini GM</span><br />
<span class="medgenPMjournal">Mol Genet Metab</span>
2015 Mar;114(3):467-73.
Epub 2014 Dec 5
doi: 10.1016/j.ymgme.2014.11.018.
<span class="bold">PMID: </span><a href="/pubmed/25523067" target="_blank">25523067</a></div>
<div><a target="_blank" href="https://pubmed.ncbi.nlm.nih.gov/?term=%22Megalencephaly-polymicrogyria-polydactyly-hydrocephalus%20syndrome%201%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 (1)</a></div><h3 class="subhead">Prognosis</h3>
<div class="nl"><a target="_blank" href="/pubmed/33958329">The Fetus with Ganglionic Eminence Abnormality: Head Size and Extracranial Sonographic Findings Predict Genetic Diagnoses and Postnatal Outcomes.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Goergen SK,
Alibrahim E,
Christie J,
Dobrotwir A,
Fahey M,
Fender L,
Frawley K,
Manikkam SA,
Pinner JR,
Sinnott S,
Romaniello R,
Sandaradura SA,
Taylor J,
Vasudevan A,
Righini A</span><br />
<span class="medgenPMjournal">AJNR Am J Neuroradiol</span>
2021 Aug;42(8):1528-1534.
Epub 2021 May 6
doi: 10.3174/ajnr.A7131.
<span class="bold">PMID: </span><a href="/pubmed/33958329" target="_blank">33958329</a><a href="/pmc/articles/PMC8367629" target="_blank" class="PubMedFree">Free PMC Article</a></div>
<div><a target="_blank" href="https://pubmed.ncbi.nlm.nih.gov/?term=%22Megalencephaly-polymicrogyria-polydactyly-hydrocephalus%20syndrome%201%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 (1)</a></div><h3 class="subhead">Clinical prediction guides</h3>
<div class="nl"><a target="_blank" href="/pubmed/33958329">The Fetus with Ganglionic Eminence Abnormality: Head Size and Extracranial Sonographic Findings Predict Genetic Diagnoses and Postnatal Outcomes.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Goergen SK,
Alibrahim E,
Christie J,
Dobrotwir A,
Fahey M,
Fender L,
Frawley K,
Manikkam SA,
Pinner JR,
Sinnott S,
Romaniello R,
Sandaradura SA,
Taylor J,
Vasudevan A,
Righini A</span><br />
<span class="medgenPMjournal">AJNR Am J Neuroradiol</span>
2021 Aug;42(8):1528-1534.
Epub 2021 May 6
doi: 10.3174/ajnr.A7131.
<span class="bold">PMID: </span><a href="/pubmed/33958329" target="_blank">33958329</a><a href="/pmc/articles/PMC8367629" target="_blank" class="PubMedFree">Free PMC Article</a></div>
<div class="nl"><a target="_blank" href="/pubmed/24705253">De novo CCND2 mutations leading to stabilization of cyclin D2 cause megalencephaly-polymicrogyria-polydactyly-hydrocephalus syndrome.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Mirzaa G,
Parry DA,
Fry AE,
Giamanco KA,
Schwartzentruber J,
Vanstone M,
Logan CV,
Roberts N,
Johnson CA,
Singh S,
Kholmanskikh SS,
Adams C,
Hodge RD,
Hevner RF,
Bonthron DT,
Braun KPJ,
Faivre L,
Rivière JB,
St-Onge J,
Gripp KW,
Mancini GM,
Pang K,
Sweeney E,
van Esch H,
Verbeek N,
Wieczorek D,
Steinraths M,
Majewski J;
FORGE Canada Consortium,
Boycot KM,
Pilz DT,
Ross ME,
Dobyns WB,
Sheridan EG</span><br />
<span class="medgenPMjournal">Nat Genet</span>
2014 May;46(5):510-515.
Epub 2014 Apr 6
doi: 10.1038/ng.2948.
<span class="bold">PMID: </span><a href="/pubmed/24705253" target="_blank">24705253</a><a href="/pmc/articles/PMC4004933" target="_blank" class="PubMedFree">Free PMC Article</a></div>
<div class="nl"><a target="_blank" href="/pubmed/22729224">De novo germline and postzygotic mutations in AKT3, PIK3R2 and PIK3CA cause a spectrum of related megalencephaly syndromes.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Rivière JB,
Mirzaa GM,
O'Roak BJ,
Beddaoui M,
Alcantara D,
Conway RL,
St-Onge J,
Schwartzentruber JA,
Gripp KW,
Nikkel SM,
Worthylake T,
Sullivan CT,
Ward TR,
Butler HE,
Kramer NA,
Albrecht B,
Armour CM,
Armstrong L,
Caluseriu O,
Cytrynbaum C,
Drolet BA,
Innes AM,
Lauzon JL,
Lin AE,
Mancini GM,
Meschino WS,
Reggin JD,
Saggar AK,
Lerman-Sagie T,
Uyanik G,
Weksberg R,
Zirn B,
Beaulieu CL;
Finding of Rare Disease Genes (FORGE) Canada Consortium,
Majewski J,
Bulman DE,
O'Driscoll M,
Shendure J,
Graham JM Jr,
Boycott KM,
Dobyns WB</span><br />
<span class="medgenPMjournal">Nat Genet</span>
2012 Jun 24;44(8):934-40.
doi: 10.1038/ng.2331.
<span class="bold">PMID: </span><a href="/pubmed/22729224" target="_blank">22729224</a><a href="/pmc/articles/PMC3408813" target="_blank" class="PubMedFree">Free PMC Article</a></div>
<div><a target="_blank" href="https://pubmed.ncbi.nlm.nih.gov/?term=%22Megalencephaly-polymicrogyria-polydactyly-hydrocephalus%20syndrome%201%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 (3)</a></div></div>
</div>
</div></div></div></div></div></div></div>
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</div>
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</div>
</div>
</div>
<div class="supplemental col three_col last">
<h2 class="offscreen_noflow">Supplemental Content</h2>
<div>
<!-- MedGen supplemental column starts here -->
<div class="rightCol mgCol">
<div class="portlet mgSection" id="ID_113">
<div class="portlet_head mgSectionHead ui-widget-header"><h1 class="nl" id="Table_of_contents">Table of contents</h1><a sid="113" href="#" class="portlet_shutter" title="Show/hide content"></a></div>
<div class="portlet_content ln"><ul id="my-toc"></ul></div>
</div>
<div class="portlet mgSection" id="ID_106">
<div class="portlet_head mgSectionHead ui-widget-header"><h1 class="nl" id="Genetic_Testing_Registry">Genetic Testing Registry</h1><a sid="106" href="#" class="portlet_shutter" title="Show/hide content"></a></div>
<div class="portlet_content ln"><ul><li><a href="/gtr/tests?term=C4012727%5bDISCUI%5d&amp;filter=method%3A2%5F8" target="_blank">Deletion/duplication analysis (23)</a></li>
<li><a href="/gtr/tests?term=C4012727%5bDISCUI%5d&amp;filter=method%3A2%5F7" target="_blank">Sequence analysis of the entire coding region (38)</a></li>
<li><a href="/gtr/tests?term=C4012727%5bDISCUI%5d&amp;filter=method%3A2%5F19" target="_blank">Targeted variant analysis (9)</a></li>
<li class="portletSeeAll portletSeeAllPad"><total><a href="/gtr/tests?term=C4012727%5bDISCUI%5d" target="_blank">See all (39)</a></total></li>
</ul></div>
</div>
<div class="portlet mgSection" id="ID_119">
<div class="portlet_head mgSectionHead ui-widget-header"><h1 class="nl" id="Clinical_resources">Clinical resources</h1><a sid="119" href="#" class="portlet_shutter" title="Show/hide content"></a></div>
<div class="portlet_content ln"><ul><li><a href="https://www.omim.org/search?index=entry&amp;start=1&amp;limit=10&amp;sort=score%20desc&amp;field=number&amp;search=603387" target="_blank">OMIM</a></li><li><a href="https://clinicaltrials.gov/search?cond=Megalencephaly-polymicrogyria-polydactyly-hydrocephalus%20syndrome%201" target="_blank">ClinicalTrials.gov</a></li></ul></div>
</div>
<div class="portlet mgSection" id="ID_115">
<div class="portlet_head mgSectionHead ui-widget-header"><h1 class="nl" id="Molecular_resources">Molecular resources</h1><a sid="115" href="#" class="portlet_shutter" title="Show/hide content"></a></div>
<div class="portlet_content ln"><ul><li><a href="http://www.omim.org/search?index=entry&amp;start=1&amp;limit=10&amp;sort=score%20desc&amp;field=number&amp;search=603157" target="_blank">OMIM</a></li><li><a href="/clinvar/?term=5296[geneid]" target="_blank">View PIK3R2 variations in ClinVar</a></li><li><a href="https://catalog.coriell.org/Search?q=603387" target="_blank">Coriell Institute for Medical Research</a></li></ul></div>
</div>
<div class="portlet mgSection" id="ID_116">
<div class="portlet_head mgSectionHead ui-widget-header"><h1 class="nl" id="Consumer_resources">Consumer resources</h1><a sid="116" href="#" class="portlet_shutter" title="Show/hide content"></a></div>
<div class="portlet_content ln"><ul><li><a href="https://www.malacards.org/card/megalencephaly_polymicrogyria_polydactyly_hydrocephalus_syndrome_1" target="_blank">MalaCards</a></li><li><a href="https://vsearch.nlm.nih.gov/vivisimo/cgi-bin/query-meta?v:project=medlineplus&amp;query=Megalencephaly-polymicrogyria-polydactyly-hydrocephalus%20syndrome%201" target="_blank">MedlinePlus</a></li><li><a href="https://medlineplus.gov/genetics/condition/megalencephaly-polymicrogyria-polydactyly-hydrocephalus-syndrome" target="_blank">MedlinePlusGenetics (GHR)</a></li><li><a href="https://rarediseases.info.nih.gov/diseases/18077/disease" target="_blank">NCATS Office of Rare Diseases Research (GARD)</a></li></ul></div>
</div>
</div>
<div class="portlet brieflink">
<div class="portlet_head">
<div class="portlet_title">
<h3>Reviews</h3>
</div>
<a name="EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_SingleItemSuplCluster.MedGenReviews.Shutter" sid="1" href="#" class="portlet_shutter" title="Show/hide content" remembercollapsed="true" pgsec_name="Reviews" id="EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_SingleItemSuplCluster.MedGenReviews.Shutter"></a>
</div>
<div class="portlet_content">
<ul>
<li>
<a href="/pubmed/27854409" ref="ncbi_uid=&amp;discoId=gtr_reviews&amp;linkpos=1&amp;linkpostotal=3" target="_blank"><span class="gene_reviews">GeneReviews</span></a>
</li>
<li>
<a href="/pubmed/clinical?term=Megalencephaly-polymicrogyria-polydactyly-hydrocephalus%20syndrome%201" ref="ncbi_uid=&amp;discoId=gtr_reviews&amp;linkpos=2&amp;linkpostotal=3" target="_blank">PubMed Clinical Queries</a>
</li>
<li>
<a href="/pubmed?term=Megalencephaly-polymicrogyria-polydactyly-hydrocephalus%20syndrome%201%20AND%20humans[mesh]%20AND%20review[publication%20type]" ref="ncbi_uid=&amp;discoId=gtr_reviews&amp;linkpos=3&amp;linkpostotal=3" target="_blank">Reviews in PubMed</a>
</li>
</ul>
</div>
</div>
<!-- MedGen supplemental column ends here -->
<div class="portlet brieflink">
<div class="portlet_head">
<div class="portlet_title">
<h3>Related information</h3>
</div>
<a name="EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_SingleItemSuplCluster.MedGenDiscoveryDbLinks.Shutter" sid="1" href="#" class="portlet_shutter" title="Show/hide content" remembercollapsed="true" pgsec_name="discovery_db_links" id="EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_SingleItemSuplCluster.MedGenDiscoveryDbLinks.Shutter"></a>
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<div class="portlet_content DiscoveryDbLinks">
<ul>
<li class="brieflinkpopper">
<a class="brieflinkpopperctrl" href="/clinvar?LinkName=medgen_clinvar&amp;from_uid=861164" ref="log$=recordlinks">ClinVar</a>
<div class="brieflinkpop offscreen_noflow">Related medical variations</div>
</li>
<li class="brieflinkpopper">
<a class="brieflinkpopperctrl" href="/gene?LinkName=medgen_gene_diseases&amp;from_uid=861164" ref="log$=recordlinks">Gene</a>
<div class="brieflinkpop offscreen_noflow">Related information in NCBI Gene</div>
</li>
<li class="brieflinkpopper">
<a class="brieflinkpopperctrl" href="/gtr/tests?term=C4012727[DISCUI]" ref="log$=recordlinks">GTR</a>
<div class="brieflinkpop offscreen_noflow">Related information in GTR</div>
</li>
<li class="brieflinkpopper">
<a class="brieflinkpopperctrl" href="/gtr/tests?term=C4012727[DISCUI]&amp;test_type=Clinical" ref="log$=recordlinks">GTR(Clinical)</a>
<div class="brieflinkpop offscreen_noflow">Clinical tests in GTR</div>
</li>
<li class="brieflinkpopper">
<a class="brieflinkpopperctrl" href="/omim?LinkName=medgen_omim&amp;from_uid=861164" ref="log$=recordlinks">OMIM</a>
<div class="brieflinkpop offscreen_noflow">Related records in OMIM</div>
</li>
<li class="brieflinkpopper">
<a class="brieflinkpopperctrl" href="/omim?LinkName=medgen_omim_gene&amp;from_uid=861164" ref="log$=recordlinks">OMIM(Genes)</a>
<div class="brieflinkpop offscreen_noflow">OMIM records containing genes associated with phenotypes registered in MedGen</div>
</li>
<li class="brieflinkpopper">
<a class="brieflinkpopperctrl" href="/pmc?LinkName=medgen_pmc&amp;from_uid=861164" ref="log$=recordlinks">PMC Articles</a>
<div class="brieflinkpop offscreen_noflow">Related information in PubMed Central Links</div>
</li>
<li class="brieflinkpopper">
<a class="brieflinkpopperctrl" href="/pubmed?LinkName=medgen_pubmed&amp;from_uid=861164" ref="log$=recordlinks">PubMed</a>
<div class="brieflinkpop offscreen_noflow">Related literature resources in PubMed</div>
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