Abstract
Malignant giant cell tumor of osseous or extraosseous origin is extremely rare, and diagnosis is reserved for those lesions that display bizarre mitosis and cytological atypia or an association with sarcoma.1 Heller et al first reported malignant giant cell tumor of the kidney without accompanying sarcoma or carcinoma.2 Their case showed a high mitotic index, variable cytological atypia in mononuclear stromal cells and widespread metastasis of perirenal tissue. We report an unusual case of malignant giant cell tumor of the kidney with osteosarcomatous transformation. CASE REPORT
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