[A case of chondrosarcoma of the low grade malignancy originated in rib].

A case with chondrosarcoma of rib, which is relatively uncommon in Japan, in a 61-year-old man is reported. Chest X-ray examination revealed an abnormal shadow in the right of the chest wall. Chest CT scan and MRI disclosed the tumor to have been arosen from the right 5th rib protruding into the thoracic cavity. Surgical resections of the tumor with parts of the 4th and 5th ribs and parietal pleura were performed. The defect of the chest wall was repaired with muscle. The tumor measured 3.0 x 3.0 x 3.5 cm in size and was a chondrosarcoma of the low grade malignancy, histologically. Post operative course was uneventful with no adjuvant therapy.