Doubled nail of the thumb. A rare form of polydactyly.
Bifid thumb is a rare manifestation of polydactyly. The trait is autosomal dominant, but the expressivity is highly variable. It must be distinguished from apical dystrophy, a rare form of brachydactyly. Severe surgical procedures have been suggested for both functional and cosmetic reasons. Two families affected are described.
Tosti
A
A
Department of Dermatology, University of Bologna, Italy.
Paoluzzi
P
P
Baran
R
R
D000328:Adult; D000013:Congenital Abnormalities / Q000235:genetics; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009264:Nails, Malformed; D011859:Radiography; D013933:Thumb / Q000002:abnormalities* / Q000000981:diagnostic imaging / Q000473:pathology