Humeroulnar synostosis: case report.

This is a report of a case of humeroulnar synostosis at the right elbow of a native Nigerian girl in whose family there is no history of genetic/hereditary diseases. This defect was not associated with any other deformity. This is a rare defect that has never been mentioned in literature. By excluding any causes, this case has been proved to be a failure of differentiation that is one of the major categories in the classification of congenital limb defects by Alfred B. Swanson.