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(A) Chest CT scan showing a pericostal mass in the left anterior chest wall. (B) Chest CT scan revealing the shirt-stud morphology of a pericostal mass measuring 8x5 cm.
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Chest X-ray showed a small left basal consolidation with little concomitant pleural effusion, while CT scan of the thoracic wall (Figure 1) showed an 8x5 cm abscess with sand-glass morphology near the last cartilaginous arch on the left, without signs of bone involvement.