Tumor de partes blandas de bajo potencial maligno: caso clínico y revisión de la literatura

the giant cell tumor of soft tissues of low potential malignancy is a very rare tumor. it？s classified in fibrohistiocytic neoplasm and has features identical to giant cell tumor of bone. we present a clinical case for this less frequent malignancy. patient 26 years old man with a tumor of 20 cm x 15 cm x 15 cm, in both lumbar and the sacral regions. histological examination revealed a neoplasm with abundant giant cells, spindle cells, hemosiderin and metaplastic bone. the immunohistochemistry studies practice showed strong positivity of cd68 for the osteoclastic cells. the patient outcome was favorable, without evidence of recurrence. it is essential to make the differential diagnosis of this kind of tumor with other neoplasm with abundant giant cells, such as the giant cell tumor of the tendon sheath and malignant giant cell, also malignant fibrous hystiocitoma, which is rich in giant cells and high grade sarcoma