LT Glickman, BW Brewer. Extensor digitorum brevis manus – Report of a case and treatment planning. Can J Plast Surg 1994;2(2):95-96. The extensor digitorum brevis manus muscle (edbm) is an anomalous extrinsic extensor that may occur in up to 3% of the population and may produce symptoms and signs that are very similar to those of a dorsal ganglion. We report a case of edbm in a male whose diagnosis was made intraoperatively. He remains symptom free following surgical resection.