Case Report: An Unusual Case of Fibroma of Extensor Tendon Sheath of Hand

Fibroma of tendon sheath (FTS) is an uncommonly encountered soft tissue mass, which is morphologically distinct from the more commonly seen giant cell tumour of tendon sheath (GCTTS). FTS is typically a slow growing, painless, firm mass with a predilection for the upper extremity, frequently involving the hand. Cases of associated triggering or compression neuropathies have been described when underlying tendons or nerves are affected. It is distinguished histologically by the lack of giant cells, foamy histiocytes and synovial cells. We present a case of FTS involving extensor tendon sheath leading to the 2nd metacarpal. A 30 year old female presented with a 3 month history of a painless mass in her left palm that was gradually increasing in size. Examination revealed a swelling which was 5x4cm in size, hard in consistency, non mobile, non adherent. Radiograph revealed a soft tissue mass with no bony abnormality. Ultrasound demonstrated a solid heterogenous mass. The patient underwent excision of the mass which was then sent for histopath examination which revealed it to be fibroma of the tendon sheath.