[Solid variant of aneurysmal bone cyst; report of a case].

We report a rare case of a solid variant of aneurysmal bone cyst (ABC) of the right 4th rib. A 29-year-old woman was admitted to our hospital for an abnormal shadow on chest X-ray. Chest computed tomography (CT) demonstrated the lesion mass to be located in the area of the right 4th rib. Bone scintigram revealed a hot spot in the right 4th rib. The right 4th rib was resected en bloc with the parietal pleura, and adjacent intercostal muscles via right anterior thoracotomy. Postoperative pathological evaluation was consistent with a solid variant of ABC.