Ganglion of the ankle

Ganglia rarely occur on the ankle. We report a case of a ganglion on the medial malleolus, originating from the sheaths of the flexor digitorum longus and tibialis posterior tendons, which posed a diagnostic dilemma for the patient's family physician, for her dermatologist, and for the orthopedic surgeon seen in consultation. Ganglia should be considered in the differential diagnosis of all periarticular cystic lesions.