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Fig. 2C. —64-year-old man with several-year history of forearm swelling. Axial STIR MR image (4566/45) distal to B reveals diffuse marrow signal abnormality (arrows) in both ulna and radius at level of adjacent soft-tissue hemangioma. Bone biopsy was not performed, and it is therefore unknown if signal change represents red marrow conversion or angiomatous involvement of bone.