Case of the Month

February 7, 2008 Diagnostic Imaging. Case of the Month -------------------------------------------------------------------------------- CLINICAL HISTORY 52-year-old man presents with anterior chest pain. FINDINGS Figure 1 shows a left chest wall mass arising from the anterior aspect of the third left rib without evidence of extension into the lung parenchyma. A 13-mm stalk (arrow) attaches to the mass at the neck of the third rib with a soft tissue component. Within the mass, there is also heterogeneous calcification. Figure 2 shows increased uptake at the left third anterior rib associated with an exophytic soft-tissue (arrow) uptake. There was no other abnormal uptake to suggest metastasis. DIAGNOSIS Pathological evaluation revealed a grade 1 (of 3) well-differentiated chondrosarcoma arising in the background of a long-standing calcified enchondroma of the anterior aspect of the left third rib.

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