Different manifestations of hyperphalangism.

Hyperphalangism, characterized by an extra phalanx between the phalanges of a finger is a rare congenital anomaly. Five cases show some of the different manifestations of this rare congenital anomaly. Brachyhyperphalangism can be inherited as an autosomal dominant trait with good penetrance, but can also simply be one manifestation of a group of congenital abnormalities.