ABSTRACT
Osteoid Osteoma occurs anywhere in skeleton. They are most common in lower extremity, particularly femur about 40%. Two-thirds of femoral lesions is in the intertrochanter or intracapsular regions of the hip. The lesion is usually cortical and may extend into the periosteal or endosteal surface of the bone. It is rare in the cancellous bone. We experienced a case of osteoid osteoma in intertrochanteric cancellous portion of the femur in 50 year old man. Many complained right hip pain worsend three weeks before his visit. Radiograph shows sclerosis around a lucent nidus in cancellous portion. The lesion did not extend to the endosteal surface. We have removed nidus and surrounding reactive portion completely with curettage. Follow up radiographic results after 20 weeks, showed no evidence of recurrence.