[Primary osteogenic renal sarcomas (author's transl)]

Renal sarcomas are rare malignant connective tissue tumors and they only represent 1 to 5% of renal cancers, according to various authors [18]. The appearance of a primary osteogenic tumor within a renal sarcoma is an extremely rare occurrence, and the mechanism by which it develops is not completely understood. The two interesting points raised by the case described in this report were the possibility of suspecting the diagnosis of renal osteogenic sarcoma on a straight x-ray film, and the images observed on ultrasonography.