Osteosarcoma is one of the most frequent bone tumours in paediatric age. It has a strong tendency to metastatic spread. Secondary involvement of the kidney with clinical evidence is a rare event (6 cases have been reported in literature). Primary osteogenic sarcoma of the urinary tract is also very unusual (20 cases of primary renal osteosarcoma have been reported until now). To our knowledge primary ureteral osteosarcoma has never been described. We present here one case of symptomatic kidney metastasis of osteosarcoma in a 20-year-old female patient and the first case of primary osteosarcoma of the ureter in an 81-year-old male patient.
