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A rare X-linked syndromic intellectual disability disorder with characteristics of profound intellectual disability, global developmental delay with absent speech, seizures, large joint contractures, abnormal position of thumbs and middle-age onset of cardiomegaly and atrioventricular valve abnormalities, resulting in subsequent congestive heart failure. Additional features include variable facial dysmorphism (notably large ears with over folded helix) and large testes. There is evidence the disease is caused by mutation in the CLIC2 gene on chromosome Xq28.
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