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Giant cell tumor of the rib.

A 34-year-old man was admitted with dull left-sided back pain. Physical examination revealed no abnormalities. Routine laboratory investigations including tumor markers were normal. Chest computed tomography demonstrated a heterogenous soft tissue tumor associated with destruction of the tenth rib in the left posterior mediastinum (Picture 1). Technetium-99m methylene diphosphonate bone scan showed intense uptake in the left tenth rib (Picture 2). Histologically, percutaneous biopsy specimen of the tumor indi-