A benign lesion composed of proliferating fibroblasts, histiocytic cells (some are hemosiderin-laden) and multinucleated giant cells of the osteoclastic type. There are
scattered lymphocytes. This is the so called localized tenosynovitis. No evidence of malignancy.
Middle finger swelling.
Soft tissue fragment measured 1.8x1.5x0.9 cm, totally embedded.
Middle finger swelling, excision biopsy: