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A 41 year male pain less swelling over the dorsum of hand since 4-years, excised 1yr back and recurred to present, Measuring 2.5 cms x3.5 cm. On the basis of clinical and histopathological finding he is diagnosed with Giant Cell Tumor of tendon sheath.

Giant cell tumor of the tendon sheath is the second most common tumor of the hand often referred to as xanthoma. Histologically these tumors are composed of multinucleated giant cells, polyhedral histiocytes, fibrosis and hemosiderin deposits. Marginal excision of giant cell tumor of the tendon sheath is the treatment of choice. We present a case of xanthoma of flexor pollicis longus tendon presented as a single enlarging mass in volar aspect of left thumb. After clinical diagnosis, work-up is done with ultrasound, FNAC and excision biopsy.

A 45 year old male patient presented with history of painless swelling on the right dorsum of ring finger palm since 4 years. Physical examination revealed irregular firm mass on the volar aspect of the left thumb measuring 13x6 cm, extending from base of the proximal phalynx to thenar crease. Movements of right ring and little finger at MCP joint were restricted. X-ray of the hand showed a dense soft tissue mass with calcification (Fig. 1). There was no periosteal reaction nor any erosionof the cortical bone. Marginal excision of the tumor was done under regional anaesthesia and was sent for histopathological examination.