Stapes Ankylosis with Broad Thumbs and Toes, also known as stapes ankylosis with broad thumb and toes, is related to symphalangism, proximal, 1a and chromosome 2q35 duplication syndrome. An important gene associated with Stapes Ankylosis with Broad Thumbs and Toes is NOG (Noggin). Affiliated tissues include bone and eye, and related phenotypes are broad thumb and conductive hearing impairment