A 28-year-old female patient presented with back pain, dyspnea and coughing. Chest radiograph showed a mass in the middle zone of the right hemithorax. CT confirmed the mass was confined to the 5th rib. During the exploratory thoracotomy, a smooth, firm mass measuring 7 x 9 x 5 cm was found to have destroyed the middle and posterior parts of the 5th rib. Together with the adjacent intercostal muscles, the 5th rib was excised en-block. Postoperative pathology was cavernous haemangioma. Cavernous haemangioma of the rib is very rare, and very few cases have been reported in the literature.