Giant Cell Tumor of Tendon Sheath

**Definition:** A tumor arising in the SYNOVIAL MEMBRANE; SYNOVIAL BURSA; or TENDON sheath. It is characterized by OSTEOCLAST-like GIANT CELLS; FOAM CELLS; pigmented HEMOSIDERIN-laden MACROPHAGES and inflammatory infiltrate. It is classified either as diffuse or localized tenosynovitis.

**Tree numbers:** - C04.557.450.565.380.690 - C05.550.870.445 - C05.651.869.762

**Synonyms:** - Fibrous Histiocytoma of Tendon Sheath - Tenosynovial Giant Cell Tumor