1. Presented by Edward McCarthy, M.D. and prepared by Orin Buetens, M.D.

A 49 year-old woman had a three year history of non-descript pain in her distal femur. Radiograph showed a radiodense lesion with a pattern of "smoke ring" formation in the medullary canal. A similar lesion was present in her tibia. The cortex of the bone was unaffected.

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