The CT scan demonstrates a curvilinear area of ossification lying adjacent to the lateral aspect of the mid left femoral shaft. The ossification appears to be contiguous with the shaft of the femur with no intervening fascial plane. The ossification appears quite mature, and is denser peripherally than adjacent to the femoral shaft. No associated periosteal reaction, or femoral cortical or medullary abnormality is identified. No adjacent soft tissue mass is noted.