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FIGURE 1. Evaluation of 12-y-old boy with acute onset of right upper arm pain and swelling. (A) Early anterior skeletal-tissue-phase scintigram of upper torso immediately after administration of 99mTc-methylene diphosphonate reveals increased soft-tissue activity in right arm. (B) Delayed anterior skeletal scintigram of upper torso reveals increased radionuclide uptake in right humerus. (C) Anterior bone marrow scintigram reveals corresponding absence of bone marrow tracer activity in right humerus. (D and E) Anterior whole-body bone marrow (D) and anterior whole-body bone (E) scintigrams indicate acute infarct of right humerus. Healing infarcts in proximal and distal right tibia and healed bone marrow infarct in left radius are also seen.
