Extensor Digitorum Brevis Manus and Ganglion.
A mass overlying the dorsal wrist presents like a ganglion cyst and is found to have an associated congenital anomaly. Extensor digitorum brevis manus anomalous muscle was found overlying the ganglion.
Transverse incision was made overlying the dorsal wrist mass and the anomalous extensor digitorum brevis muscle was encountered.
Close up view of the anomalous muscle.
Muscle is retracted and the ganglion is identified.