Figure 4a. Cortical destruction. (a) Plain radiograph of a 24-year-old man with right elbow pain shows a pathologic fracture through the markedly eroded ulna and extensive cortical breakthrough. A soft-tissue mass is also seen. (b, c) Coronal STIR image (4,800/30; flip angle, 180°) (b) and axial contrast-enhanced T1-weighted image (700/12; flip angle, 90°) (c) reveal a large soft-tissue mass and marrow involvement. On c, areas of necrosis are seen within the soft-tissue part of the lesion.