Fig. 3
From: Proton MR spectroscopy in characterization of focal bone lesions of peripheral skeleton
A 22-year-old male patient with swelling in the left knee. a AP radiograph of the left knee. Lytic destruction (arrow) of medial femoral condyle with erosion of medial tibial plateau. b STIR image shows an eccentric hyper intense epimetaphyseal destructive lesion with soft tissue mass in the distal femur (arrow). c MRS shows discrete small choline peak at 3.2 ppm. d HNE 200× show lobules of malignant cartilage with spindling at the periphery and osteoid formation suggestive of chondrogenic osteosarcoma