label: Malignant Tenosynovial Giant Cell Tumor
label_lc: malignant tenosynovial giant cell tumor
description: "An uncommon malignant tumor arising from the tendon sheath. Morphologically, it is characterized by the presence of a cellular infiltrate reminiscent of a giant cell tumor with prominent malignant characteristics. Recurrent giant cell tumors with a sarcomatous dedifferentiation are included in this category as well."