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Incidental detection of a popliteal pseudoaneurysm on bone scintigraphy.

An 84-year-old man reported left subscapular pain and was referred for a bone scan to rule out metastatic disease. The past medical history was significant for bladder carcinoma and aorto-bifemoral and bilateral femoral-popliteal bypass grafting. Amorphous extraosseous radiotracer uptake was identified in the right popliteal fossa on the bone scan. A diagnosis of myositis ossificans was considered. Radiographs were obtained that showed a soft-tissue mass with a partially calcified wall suspicious for a popliteal pseudoaneurysm. Angiography confirmed the presence of a large popliteal artery pseudoaneurysm arising from the distal aspect of the right femoral-popliteal bypass graft.