| A rare genetic syndromic deafness with characteristics of severe to profound, bilateral, sensorineural hearing loss (congenital or rapidly progressive in infancy) associated with a complex brain malformation including hydrocephalus, varying degrees of partial corpus callosum agenesis, colpocephaly, cerebral and cerebellar cortical dysplasia (bilateral medial frontal polymicrogyria, bilateral frontal subcortical heterotopia) and in some, arachnoid cysts. Major physical abnormalities or psychomotor delay are usually not associated. Caused by homozygous or compound heterozygous mutation in the GPSM2 gene on chromosome 1p13. |
