Fig. 16From: Lesions involving the outer surface of the bone in children: a pictorial reviewParosteal osteosarcoma on the left distal posterior femur. A lateral radiograph of the left knee a shows a large exophytic mass with central dense ossifications adjacent to the femur (arrow). Sagittal T1 b and T2 c MR images demonstrate heterogeneous signal through this large soft-tissue tumor on both T1 and T2. A sagittal T1 post-contrast image d reveals heterogeneous contrast enhancement (arrow)Back to article page