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(A) Chest radiograph shows a well-defined oval nodule (arrow) in the left lower lung field. (B) Chest computed tomography (CT) at the initial visit shows a well-defined, oval, calcified mass (arrow) on the ventral side of the left thoracic cavity. (C) Follow-up CT shows migration of the calcified mass (arrow) on the dorsal side of the left thoracic cavity.
