[Ewing's sarcoma in old patients-a case report]

Ewing's sarcoma is a primitive bone tumor rarely observed in old patients. The main sign is osseous pain. The authors report a case of localized Ewing's sarcoma at left femur in a 42-years-old patient, revealed by an hydarthrosis of the knee, that was the only sign of appeal. Diagnosis was suspected on the radiological aspect and was confirmed by a surgical biopsy