Intellectual disability-hypoplastic corpus callosum-preauricular tag syndrome is characterised by a hypoplastic corpus callosum, microcephaly, severe intellectual deficit, preauricular skin tags, camptodactyly, growth retardation, and recurrent bronchopneumonia. It has been described in four patients in two families. Transmission is autosomal recessive.

The distal interphalangeal joint and/or the proximal interphalangeal joint of the fingers cannot be extended to 180 degrees by either active or passive extension.