Figure 8. Primary non-Hodgkin's lymphoma of bone. (a) Plain radiograph shows sclerosis and periosteal reaction affecting the distal diaphysis and metaphysis of the right femur. (b) Sagittal STIR and (c) T₁ weighted post gadolinium coronal MRI show irregular high signal periosteal thickening (b) and an ill-defined enhancing soft tissue mass (c).