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<meta name="keywords" content="C1864716, atrophy of intrinsic hand muscles, atrophy of the intrinsic hand muscles, finding, intrinsic hand muscle atrophy, 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="Atrophy of the intrinsic muscle groups of the hand, comprising the thenar and hypothenar muscles; the interossei muscles; and the lumbrical muscles." /><meta name="robots" content="index,nofollow,noarchive" />
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<title>Intrinsic hand muscle atrophy (Concept Id: C1864716)
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<!--
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<!--imgCountBooks = 0--><h1 class="medgenTitle"><div class="MedGenTitleText">Intrinsic hand muscle atrophy</div></h1><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>351202</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.">C1864716</a></dd><dt><span class="dotprefix"></span></dt><dd>Finding</dd></dl></div></div><table class="medgenTable"><tbody><tr><td>Synonyms:</td>
<td>Atrophy of intrinsic hand muscles; Atrophy of the intrinsic hand muscles</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:0008954">HP:0008954</a></td></tr>
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<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">Atrophy of the intrinsic muscle groups of the hand, comprising the thenar and hypothenar muscles; the interossei muscles; and the lumbrical muscles. [from <a title="Human Phenotype Ontology" href="http://www.human-phenotype-ontology.org" class="defSource" target="_blank">HPO</a>]</div>
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<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></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="matched_ds"><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">Intrinsic hand muscle atrophy</span></li></ul></div></div></div></div></div><div id="tabMGEN"><div class="ds_tree"><ul><li><span class="TLline"><a href="/medgen/867380" ref="tree=MeSH" title="MedGen record for Abnormality of the musculature">Abnormality of the musculature</a></span><ul><li><span class="TLline"><a href="/medgen/868776" ref="tree=MeSH" title="MedGen record for Abnormal skeletal muscle morphology">Abnormal skeletal muscle morphology</a></span><ul><li><span class="TLline"><a href="/medgen/892680" ref="tree=MeSH" title="MedGen record for Muscular atrophy">Muscular atrophy</a></span><ul><li><span class="TLline"><a href="/medgen/867165" ref="tree=MeSH" title="MedGen record for Upper limb amyotrophy">Upper limb amyotrophy</a></span><ul><li><span class="TLline"><a href="/medgen/867223" ref="tree=MeSH" title="MedGen record for Distal upper limb amyotrophy">Distal upper limb amyotrophy</a></span><ul><li><span class="TLline"><a href="/medgen/116091" ref="tree=MeSH" title="MedGen record for Hand muscle atrophy">Hand muscle atrophy</a></span><ul><li><span class="matched_ds">Intrinsic hand muscle atrophy</span></li></ul></li></ul></li></ul></li></ul></li></ul></li></ul></li></ul></div></div></div></div>
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<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_162903"><div><strong>Deafness dystonia syndrome</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>162903</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:">C0796074</span></a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Males with deafness-dystonia-optic neuronopathy (DDON) syndrome have prelingual or postlingual sensorineural hearing impairment in early childhood, slowly progressive dystonia or ataxia in the teens, slowly progressive decreased visual acuity from optic atrophy beginning at approximately age 20 years, and dementia beginning at approximately age 40 years. Psychiatric symptoms such as personality change and paranoia may appear in childhood and progress. The hearing impairment appears to be consistent in age of onset and progression, whereas the neurologic, visual, and neuropsychiatric signs vary in degree of severity and rate of progression. Females may have mild hearing impairment and focal dystonia.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/162903">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_338045"><div><strong>Mitochondrial DNA depletion syndrome 6 (hepatocerebral type)</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>338045</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.">C1850406</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">MPV17-related mitochondrial DNA (mtDNA) maintenance defect presents in the vast majority of affected individuals as an early-onset encephalohepatopathic (hepatocerebral) disease that is typically associated with mtDNA depletion, particularly in the liver. A later-onset neuromyopathic disease characterized by myopathy and neuropathy, and associated with multiple mtDNA deletions in muscle, has also rarely been described. MPV17-related mtDNA maintenance defect, encephalohepatopathic form is characterized by: Hepatic manifestations (liver dysfunction that typically progresses to liver failure, cholestasis, hepatomegaly, and steatosis); Neurologic involvement (developmental delay, hypotonia, microcephaly, and motor and sensory peripheral neuropathy); Gastrointestinal manifestations (gastrointestinal dysmotility, feeding difficulties, and failure to thrive); and Metabolic derangements (lactic acidosis and hypoglycemia). Less frequent manifestations include renal tubulopathy, nephrocalcinosis, and hypoparathyroidism. Progressive liver disease often leads to death in infancy or early childhood. Hepatocellular carcinoma has been reported.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/338045">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_419336"><div><strong>Congenital myasthenic syndrome 1A</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>419336</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.">C2931107</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Congenital myasthenic syndromes (CMS) are a group of inherited disorders affecting the neuromuscular junction (NMJ). Patients present clinically with onset of variable muscle weakness between infancy and adulthood. These disorders have been classified according to the location of the defect: presynaptic, synaptic, and postsynaptic, as well as by pathologic mechanism and electrophysiologic studies (i.e., acetylcholine receptor (AChR) deficiency, slow-channel or fast-channel kinetic defects at the AChR) (summary by Engel et al., 2003; Engel et al., 2015). Approximately 10% of CMS cases are presynaptic, 15% are synaptic, and 75% are postsynaptic, the majority of which are caused by AChR deficiency (Engel et al., 2003).&#13; Slow-channel congenital myasthenic syndrome (SCCMS) is a disorder of the postsynaptic NMJ characterized by early-onset progressive muscle weakness. The disorder results from kinetic abnormalities of the AChR channel, specifically prolonged opening and activity of the channel, which causes prolonged synaptic currents resulting in a depolarization block. This is associated with calcium overload, which may contribute to subsequent degeneration of the endplate and postsynaptic membrane. Treatment with quinine, quinidine, or fluoxetine may be helpful; acetylcholinesterase inhibitors and amifampridine should be avoided (summary by Engel et al., 2015).&#13; Genetic Heterogeneity of Congenital Myasthenic Syndromes&#13; Recessive mutations in subunits of the acetylcholine receptor are the most common cause of CMS (Harper, 2004). CMS1A and CMS1B (608930) are caused by mutation in the CHRNA1 gene (100690); CMS2A (616313) and CMS2C (616314) are caused by mutation in the CHRNB1 gene (100710) on 17p12; CMS3A (616321), CMS3B (616322), and CMS3C (616323) are caused by mutation in the CHRND gene (100720) on 2q33; and CMS4A (605809), CMS4B (616324), and CMS4C (608931) are caused by mutation in the CHRNE gene (100725) on 17p13.&#13; CMS5 (603034) is caused by mutation in the COLQ gene (603033) on 3p25; CMS6 (254210) is caused by mutation in the CHAT gene (118490) on 10q; CMS7 (616040) is caused by mutation in the SYT2 gene (600104) on 1q32; CMS8 (615120) is caused by mutation in the AGRN gene (103320) on 1p; CMS9 (616325) is caused by mutation in the MUSK gene (601296) on 9q31; CMS10 (254300) is caused by mutation in the DOK7 gene (610285) on 4p; CMS11 (616326) is caused by mutation in the RAPSN gene (601592) on 11p11; CMS12 (610542) is caused by mutation in the GFPT1 gene (138292) on 2p14; CMS13 (614750) is caused by mutation in the DPAGT1 gene (191350) on 11q23; CMS14 (616228) is caused by mutation in the ALG2 gene (607905) on 9q22; CMS15 (616227) is caused by mutation in the ALG14 gene (612866) on 1p21; CMS16 (614198) is caused by mutation in the SCN4A gene (603967) on 17q; CMS17 (616304) is caused by mutation in the LRP4 gene (604270) on 11p12; CMS18 (616330) is caused by mutation in the SNAP25 gene (600322) on 20p11; CMS19 (616720) is caused by mutation in the COL13A1 gene (120350) on 10q22; CMS20 (617143) is caused by mutation in the SLC5A7 gene (608761) on 2q12; CMS21 (617239) is caused by mutation in the SLC18A3 gene (600336) on 10q11; CMS22 (616224) is caused by mutation in the PREPL gene (609557) on 2p21; CMS23 (618197) is caused by mutation in the SLC25A1 gene (190315) on 22q11; CMS24 (618198) is caused by mutation in the MYO9A gene (604875) on 15q22; and CMS25 (618323) is caused by mutation in the VAMP1 gene (185880) on 12p13.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/419336">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_461969"><div><strong>Neuronopathy, distal hereditary motor, type 2C</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>461969</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.">C3150619</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Distal hereditary motor neuropathy, type II is a progressive disorder that affects nerve cells (neurons) in the brain and spinal cord. This condition specifically affects motor neurons, which are specialized cells that control muscle movement. Damage to motor neurons results in muscle weakness that worsens over time. Distal hereditary motor neuropathy, type II weakness primarily affects movement in the legs.\n\nThe signs and symptoms of distal hereditary motor neuropathy, type II often begin in adolescence to mid-adulthood. The initial symptoms of the disorder are cramps or weakness in the muscles of the big toe and, later, the entire foot. During the next 5 to 10 years, affected individuals experience a gradual loss of muscle tissue (atrophy) in the lower legs, which can lead to problems with walking (gait disturbance) and high arches (pes cavus). Over time, the lower legs may become paralyzed. The thigh muscles may also undergo muscle atrophy, although this generally occurs later and is less severe than the muscle atrophy in the lower legs.\n\nPeople with distal hereditary motor neuropathy, type II can have exaggerated reflexes (hyperreflexia) or other minor disturbances in the nerves used to detect sensations (sensory neuropathy). Sensory neuropathy is uncommon in people with distal hereditary motor neuropathy, type II and is typically a feature of a disorder calledCharcot-Marie-Tooth disease. These two disorders have overlapping features and can also share a genetic\n\nSome individuals with distal hereditary motor neuropathy, type II can also experience weaken the muscles in the hands and forearms. This weakening is less severe than the weakening in the lower limbs and does not usually lead to paralysis. In rare cases, affected individuals experience hearing loss.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/461969">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_481798"><div><strong>Neuropathy, hereditary sensory, type 2C</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>481798</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.">C3280168</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Hereditary sensory and autonomic neuropathy type II (HSAN2) is characterized by progressively reduced sensation to pain, temperature, and touch. Onset can be at birth and is often before puberty. The sensory deficit is predominantly distal with the lower limbs more severely affected than the upper limbs. Over time sensory function becomes severely reduced. Unnoticed injuries and neuropathic skin promote ulcerations and infections that result in spontaneous amputation of digits or the need for surgical amputation. Osteomyelitis is common. Painless fractures can complicate the disease. Autonomic disturbances are variable and can include hyperhidrosis, tonic pupils, and urinary incontinence in those with more advanced disease.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/481798">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_482073"><div><strong>Distal myopathy, Tateyama type</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>482073</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.">C3280443</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">CAV3-related distal myopathy is one form of distal myopathy, a group of disorders characterized by weakness and loss of function affecting the muscles farthest from the center of the body (distal muscles), such as those of the hands and feet. People with CAV3-related distal myopathy experience wasting (atrophy) and weakness of the small muscles in the hands and feet that generally become noticeable in adulthood. A bump or other sudden impact on the muscles, especially those in the forearms, may cause them to exhibit repetitive tensing (percussion-induced rapid contraction). The rapid contractions can continue for up to 30 seconds and may be painful. Overgrowth (hypertrophy) of the calf muscles can also occur in CAV3-related distal myopathy. The muscles closer to the center of the body (proximal muscles) such as the thighs and upper arms are normal in this condition.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/482073">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_761704"><div><strong>Charcot-Marie-Tooth disease type 4F</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>761704</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.">C3540453</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Charcot-Marie-Tooth disease type 4F (CMT4F) is an autosomal recessive demyelinating neuropathy characterized by distal sensory impairment and distal muscle weakness and atrophy affecting the lower more than the upper limbs. Nerve conduction velocities are decreased and sural nerve biopsy shows loss of myelinated fibers. The age at onset is variable and can range from childhood to adult years. When the onset is in infancy, the phenotype is characterized as Dejerine-Sottas syndrome (DSS; 145900).&#13; For a phenotypic description and a discussion of genetic heterogeneity of autosomal recessive demyelinating Charcot-Marie-Tooth disease, see CMT4A (214400).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/761704">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_813032"><div><strong>Charcot-Marie-Tooth disease X-linked dominant 6</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>813032</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.">C3806702</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">A rare genetic principally axonal peripheral sensorimotor neuropathy with an X-linked dominant inheritance pattern and the childhood-onset of slowly progressive, moderate to severe, distal muscle weakness and atrophy of the lower extremities, as well as distal, pan modal sensory abnormalities, bilateral foot deformities (pes cavus, clawed toes), absent ankle reflexes and gait abnormalities (steppage gait). Females are usually asymptomatic or only present mild manifestations (mild postural hand tremor, mild wasting of hand intrinsic muscles).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/813032">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_815985"><div><strong>Charcot-Marie-Tooth disease type 2R</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>815985</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.">C3809655</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">A rare subtype of axonal hereditary motor and sensory neuropathy characterised by early-onset axial hypotonia, generalised muscle weakness, absent deep tendon reflexes and decreased muscle mass. Electromyography reveals decreased motor nerve conduction velocities with markedly reduced sensory and motor amplitudes. There is evidence the disease is caused by homozygous or compound heterozygous mutation in the TRIM2 gene on chromosome 4q.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/815985">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1684871"><div><strong>Neurodevelopmental disorder with ataxia, hypotonia, and microcephaly</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1684871</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.">C5231413</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1684871">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1794213"><div><strong>Charcot-Marie-Tooth disease, axonal, Type 2HH</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1794213</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.">C5562003</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Axonal Charcot-Marie-Tooth disease type 2HH (CMT2HH) is an autosomal dominant peripheral neuropathy characterized predominantly by onset of vocal cord weakness resulting in stridor in infancy or early childhood. The vocal cord paresis remains throughout life and may be severe enough to require tracheostomy. Additional features of the disorder usually include pes cavus and scoliosis. Some patients have mild distal muscle weakness and atrophy primarily affecting the lower limbs, although the upper limbs may also be involved, and distal sensory impairment, often with hyporeflexia (Sullivan et al., 2020).&#13; For a discussion of genetic heterogeneity of axonal CMT, see CMT2A1 (118210).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1794213">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1800448"><div><strong>Charcot-Marie-Tooth disease axonal type 2Z</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1800448</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.">C5569025</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Charcot-Marie-Tooth disease type 2Z (CMT2Z) is an autosomal dominant axonal peripheral neuropathy characterized by onset, usually in the first decade, of distal lower limb muscle weakness and sensory impairment. The disorder is progressive, and affected individuals tend to develop upper limb and proximal muscle involvement in an asymmetric pattern, resulting in severe disability late in adulthood. Rare occurrence of global developmental delay with impaired intellectual development or learning difficulties has been observed. In some instances, the same mutation may result in different phenotypic manifestations (CMT2Z or DIGFAN), which highlights the clinical spectrum associated with MORC2 mutations and may render the classification of patients into one or the other disorder challenging (summary by Sevilla et al., 2016, Ando et al., 2017, Guillen Sacoto et al., 2020).&#13; For a phenotypic description and a discussion of genetic heterogeneity of axonal CMT, see CMT2A1 (118210).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1800448">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1824000"><div><strong>Charcot-Marie-Tooth disease, axonal, IIa 2II</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1824000</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.">C5774227</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Axonal Charcot-Marie-Tooth disease type 2II (CMT2II) is an autosomal dominant neurologic disorder characterized by a slowly progressive sensorimotor peripheral neuropathy affecting mainly the lower limbs, resulting in distal muscle weakness and atrophy and subsequent walking difficulties. Some patients may have upper limb involvement with atrophy of the intrinsic hand muscles. The age at onset is highly variable, ranging from infancy to adulthood. Electrophysiologic studies are usually consistent with an axonal process, although some may show intermediate or even demyelinating values (Park et al., 2020; Ando et al., 2022). One family with possible autosomal recessive inheritance has been reported (Bogdanova-Mihaylova et al., 2021).&#13; For a discussion of genetic heterogeneity of axonal CMT, see CMT2A1 (118210).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1824000">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1840995"><div><strong>Amyotrophic lateral sclerosis 27, juvenile</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1840995</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.">C5830359</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Juvenile amyotrophic lateral sclerosis-27 (ALS27) is an autosomal dominant disorder characterized by early childhood-onset lower extremity spasticity manifesting as toe walking and gait abnormalities, followed by progressive lower motor neuron-mediated weakness without sensory signs or symptoms (Mohassel et al., 2021).&#13; For a discussion of genetic heterogeneity of amyotrophic lateral sclerosis, see ALS1 (105400).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1840995">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_989503"><div><strong>Congenital disorder of deglycosylation 1</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>989503</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier assigned by MedGen (starting with CN) for terms&#10;that cannot be identified in NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">CN306977</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Individuals with NGLY1-related congenital disorder of deglycosylation (NGLY1-CDDG) typically display a clinical tetrad of developmental delay / intellectual disability in the mild to profound range, hypo- or alacrima, elevated liver transaminases that may spontaneously resolve in childhood, and a complex hyperkinetic movement disorder that can include choreiform, athetoid, dystonic, myoclonic, action tremor, and dysmetric movements. About half of affected individuals will develop clinical seizures. Other findings may include obstructive and/or central sleep apnea, oral motor defects that affect feeding ability, auditory neuropathy, constipation, scoliosis, and peripheral neuropathy.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/989503">Condition Record</a></div></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_1840995" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Amyotrophic lateral sclerosis 27, juvenile</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_1800448" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Charcot-Marie-Tooth disease axonal type 2Z</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_815985" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Charcot-Marie-Tooth disease type 2R</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_761704" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Charcot-Marie-Tooth disease type 4F</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_813032" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Charcot-Marie-Tooth disease X-linked dominant 6</a></div><div class="jig-moreless" data-jigconfig="class: 'moveDown', moreText: 'See full list (15)', lessText: 'Show less', nodeBefore: 0"><span id="clinMore">
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_1824000" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Charcot-Marie-Tooth disease, axonal, IIa 2II</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_1794213" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Charcot-Marie-Tooth disease, axonal, Type 2HH</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_989503" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Congenital disorder of deglycosylation 1</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_419336" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Congenital myasthenic syndrome 1A</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_162903" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Deafness dystonia syndrome</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_482073" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Distal myopathy, Tateyama type</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_338045" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Mitochondrial DNA depletion syndrome 6 (hepatocerebral type)</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_1684871" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Neurodevelopmental disorder with ataxia, hypotonia, and microcephaly</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_461969" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Neuronopathy, distal hereditary motor, type 2C</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_481798" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Neuropathy, hereditary sensory, type 2C</a></div></span></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/32938559">Differentiation of ulnar neuropathy at the wrist due to ganglion cyst from ulnar neuropathy at the elbow.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Omejec G,
Podnar S</span><br />
<span class="medgenPMjournal">Neurophysiol Clin</span>
2020 Oct;50(5):345-351.
Epub 2020 Sep 13
doi: 10.1016/j.neucli.2020.08.004.
<span class="bold">PMID: </span><a href="/pubmed/32938559" target="_blank">32938559</a></div>
<div class="nl"><a target="_blank" href="/pubmed/27575868">Reverse split hand syndrome: Dissociated intrinsic hand muscle atrophy pattern in Hirayama disease/brachial monomelic amyotrophy.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Singh RJ,
Preethish-Kumar V,
Polavarapu K,
Vengalil S,
Prasad C,
Nalini A</span><br />
<span class="medgenPMjournal">Amyotroph Lateral Scler Frontotemporal Degener</span>
2017 Feb;18(1-2):10-16.
Epub 2016 Aug 30
doi: 10.1080/21678421.2016.1223140.
<span class="bold">PMID: </span><a href="/pubmed/27575868" target="_blank">27575868</a></div>
<div class="nl"><a target="_blank" href="/pubmed/26996473">Pattern Differences of Small Hand Muscle Atrophy in Amyotrophic Lateral Sclerosis and Mimic Disorders.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Fang J,
Liu MS,
Guan YZ,
Du H,
Li BH,
Cui B,
Ding QY,
Cui LY</span><br />
<span class="medgenPMjournal">Chin Med J (Engl)</span>
2016 Apr 5;129(7):792-8.
doi: 10.4103/0366-6999.178953.
<span class="bold">PMID: </span><a href="/pubmed/26996473" target="_blank">26996473</a><a href="/pmc/articles/PMC4819298" target="_blank" class="PubMedFree">Free PMC Article</a></div>
<div class="nl"><a target="_blank" href="/pubmed/17894620">Clinical and MRI predictors of outcome after surgical intervention for cervical spondylotic myelopathy.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Alafifi T,
Kern R,
Fehlings M</span><br />
<span class="medgenPMjournal">J Neuroimaging</span>
2007 Oct;17(4):315-22.
doi: 10.1111/j.1552-6569.2007.00119.x.
<span class="bold">PMID: </span><a href="/pubmed/17894620" target="_blank">17894620</a></div>
<div><a target="_blank" href="https://pubmed.ncbi.nlm.nih.gov/?term=%22Intrinsic%20hand%20muscle%20atrophy%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 (4)</a></div><h3 class="subhead">Diagnosis</h3>
<div class="nl"><a target="_blank" href="/pubmed/27575868">Reverse split hand syndrome: Dissociated intrinsic hand muscle atrophy pattern in Hirayama disease/brachial monomelic amyotrophy.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Singh RJ,
Preethish-Kumar V,
Polavarapu K,
Vengalil S,
Prasad C,
Nalini A</span><br />
<span class="medgenPMjournal">Amyotroph Lateral Scler Frontotemporal Degener</span>
2017 Feb;18(1-2):10-16.
Epub 2016 Aug 30
doi: 10.1080/21678421.2016.1223140.
<span class="bold">PMID: </span><a href="/pubmed/27575868" target="_blank">27575868</a></div>
<div class="nl"><a target="_blank" href="/pubmed/26996473">Pattern Differences of Small Hand Muscle Atrophy in Amyotrophic Lateral Sclerosis and Mimic Disorders.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Fang J,
Liu MS,
Guan YZ,
Du H,
Li BH,
Cui B,
Ding QY,
Cui LY</span><br />
<span class="medgenPMjournal">Chin Med J (Engl)</span>
2016 Apr 5;129(7):792-8.
doi: 10.4103/0366-6999.178953.
<span class="bold">PMID: </span><a href="/pubmed/26996473" target="_blank">26996473</a><a href="/pmc/articles/PMC4819298" target="_blank" class="PubMedFree">Free PMC Article</a></div>
<div class="nl"><a target="_blank" href="/pubmed/24637778">Utility of dissociated intrinsic hand muscle atrophy in the diagnosis of amyotrophic lateral sclerosis.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Menon P,
Vucic S</span><br />
<span class="medgenPMjournal">J Vis Exp</span>
2014 Mar 4;(85)
doi: 10.3791/51056.
<span class="bold">PMID: </span><a href="/pubmed/24637778" target="_blank">24637778</a><a href="/pmc/articles/PMC4123526" target="_blank" class="PubMedFree">Free PMC Article</a></div>
<div class="nl"><a target="_blank" href="/pubmed/17894620">Clinical and MRI predictors of outcome after surgical intervention for cervical spondylotic myelopathy.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Alafifi T,
Kern R,
Fehlings M</span><br />
<span class="medgenPMjournal">J Neuroimaging</span>
2007 Oct;17(4):315-22.
doi: 10.1111/j.1552-6569.2007.00119.x.
<span class="bold">PMID: </span><a href="/pubmed/17894620" target="_blank">17894620</a></div>
<div class="nl"><a target="_blank" href="/pubmed/14964585">Advanced Hirayama disease with successful improvement of activities of daily living by operative reconstruction.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Chiba S,
Yonekura K,
Nonaka M,
Imai T,
Matumoto H,
Wada T</span><br />
<span class="medgenPMjournal">Intern Med</span>
2004 Jan;43(1):79-81.
doi: 10.2169/internalmedicine.43.79.
<span class="bold">PMID: </span><a href="/pubmed/14964585" target="_blank">14964585</a></div>
<div><a target="_blank" href="https://pubmed.ncbi.nlm.nih.gov/?term=%22Intrinsic%20hand%20muscle%20atrophy%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 (6)</a></div><h3 class="subhead">Prognosis</h3>
<div class="nl"><a target="_blank" href="/pubmed/17894620">Clinical and MRI predictors of outcome after surgical intervention for cervical spondylotic myelopathy.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Alafifi T,
Kern R,
Fehlings M</span><br />
<span class="medgenPMjournal">J Neuroimaging</span>
2007 Oct;17(4):315-22.
doi: 10.1111/j.1552-6569.2007.00119.x.
<span class="bold">PMID: </span><a href="/pubmed/17894620" target="_blank">17894620</a></div>
<div class="nl"><a target="_blank" href="/pubmed/14964585">Advanced Hirayama disease with successful improvement of activities of daily living by operative reconstruction.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Chiba S,
Yonekura K,
Nonaka M,
Imai T,
Matumoto H,
Wada T</span><br />
<span class="medgenPMjournal">Intern Med</span>
2004 Jan;43(1):79-81.
doi: 10.2169/internalmedicine.43.79.
<span class="bold">PMID: </span><a href="/pubmed/14964585" target="_blank">14964585</a></div>
<div><a target="_blank" href="https://pubmed.ncbi.nlm.nih.gov/?term=%22Intrinsic%20hand%20muscle%20atrophy%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 (2)</a></div><h3 class="subhead">Clinical prediction guides</h3>
<div class="nl"><a target="_blank" href="/pubmed/26996473">Pattern Differences of Small Hand Muscle Atrophy in Amyotrophic Lateral Sclerosis and Mimic Disorders.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Fang J,
Liu MS,
Guan YZ,
Du H,
Li BH,
Cui B,
Ding QY,
Cui LY</span><br />
<span class="medgenPMjournal">Chin Med J (Engl)</span>
2016 Apr 5;129(7):792-8.
doi: 10.4103/0366-6999.178953.
<span class="bold">PMID: </span><a href="/pubmed/26996473" target="_blank">26996473</a><a href="/pmc/articles/PMC4819298" target="_blank" class="PubMedFree">Free PMC Article</a></div>
<div class="nl"><a target="_blank" href="/pubmed/17894620">Clinical and MRI predictors of outcome after surgical intervention for cervical spondylotic myelopathy.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Alafifi T,
Kern R,
Fehlings M</span><br />
<span class="medgenPMjournal">J Neuroimaging</span>
2007 Oct;17(4):315-22.
doi: 10.1111/j.1552-6569.2007.00119.x.
<span class="bold">PMID: </span><a href="/pubmed/17894620" target="_blank">17894620</a></div>
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<div class="portlet_content ln"><span class="medgenPMauthor">Ochi H,
Murai H,
Osoegawa M,
Minohara M,
Inaba S,
Kira J</span><br />
<span class="medgenPMjournal">J Neurol Sci</span>
2003 Jan 15;206(1):109-14.
doi: 10.1016/s0022-510x(02)00277-0.
<span class="bold">PMID: </span><a href="/pubmed/12480093" target="_blank">12480093</a></div>
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<p class="address_footer text-white">National Library of Medicine<br />
<a href="https://www.google.com/maps/place/8600+Rockville+Pike,+Bethesda,+MD+20894/@38.9959508,-77.101021,17z/data=!3m1!4b1!4m5!3m4!1s0x89b7c95e25765ddb:0x19156f88b27635b8!8m2!3d38.9959508!4d-77.0988323" class="text-white" target="_blank" rel="noopener noreferrer">8600 Rockville Pike<br />
Bethesda, MD 20894</a></p>
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<p><a href="https://www.nlm.nih.gov/web_policies.html" class="text-white">Web Policies</a><br />
<a href="https://www.nih.gov/institutes-nih/nih-office-director/office-communications-public-liaison/freedom-information-act-office" class="text-white">FOIA</a><br />
<a href="https://www.hhs.gov/vulnerability-disclosure-policy/index.html" class="text-white" id="vdp">HHS Vulnerability Disclosure</a></p>
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<p><a class="supportLink text-white" href="https://support.nlm.nih.gov/">Help</a><br />
<a href="https://www.nlm.nih.gov/accessibility.html" class="text-white">Accessibility</a><br />
<a href="https://www.nlm.nih.gov/careers/careers.html" class="text-white">Careers</a></p>
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<div class="row">
<div class="col-lg-12 centered-lg">
<nav class="bottom-links">
<ul class="mt-3">
<li>
<a class="text-white" href="//www.nlm.nih.gov/">NLM</a>
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<li>
<a class="text-white" href="https://www.nih.gov/">NIH</a>
</li>
<li>
<a class="text-white" href="https://www.hhs.gov/">HHS</a>
</li>
<li>
<a class="text-white" href="https://www.usa.gov/">USA.gov</a>
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</ul>
</nav>
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