This syndrome has characteristics of congenital conductive deafness due to stapes ankylosis, broad thumbs and first toes and hyperopia. So far, it has been described in multiple members of six families. Other skeletal malformations were also reported including short distal phalanges and syndactyly, but symphalangism is usually absent. Transmission is autosomal dominant and the syndrome is caused by mutations in the NOG gene (17q22).