An unusual case of fibular (postaxial) polydactyly: extrametatarsal head with fused duplication of the proximal phalanx.

Polydactyly of the foot is a congenital anomaly characterized by the appearance of all or part of 1 or more additional rays. A number of morphologically and anatomically based classifications exist. We present an unusual case of fibular (postaxial) polydactyly characterized by an extrametatarsal head with fused duplication of the proximal phalanx.