88(88) 日呼 外 会誌 chondromyxoid 瘍 の1彩 fibromaの 以 下 と比 較 的 稀 で,男 に 多 く,30歳 図5 切 図6 病 理 組 織像 発 生 頻 度 は 全 骨腫 女 比 はや や 男性 ま で の 若 年 者 に 多 く見 ら れ る3-7). 除 標 第3巻1号 (平成 元 年3.月) 本 発 生 部位 と して は長 幹 骨 の 末 端 に 発生 す る こ と が 多 く,68 89%は 下 肢,特 に脛 骨 に発 生 し, 肩 甲骨,胸 骨,頭 蓋 骨 に発 生 す る こ とは比 較 的

likely to be mistaken especially for chondrosarcoma, Arch. Pathol., 45: 541-551, 1948. 198-204, 1983. 2) Firminger HI (edit'): Atlas of tumor pathology, Second series, Fasc. 5. Tumors of bone and cartilage, 50-59. Armed Forces Institute of Pathology. Washington DC, 1971. 3) Feldman F, Hect H, Johnston AD: Chondromyxoid fibroma of bone, Radiology, 94: 249-260, 1970. 4) Rahimi A, Beabout JW, Iv ns JC et al: Chondromyxoid fibroma: A clinicopathological study of 76 cases, Cancer, 30: 726-736, 1972. 5) Shazowicz F, Gallardo H: Chondromyxoid fibroma (fibromyxoid chondroma) of bone: A clinicopathological study of thirty-two cases, J Bone and Joint Surg, 53B: 198-216, 1971. 6) Cherlinzoni F, Rock M, Picci P: Chondromyxoid fibroma, J Bone and Joint Surg, 65-A: 7) Boggs IG, Stoker DJ: Chondromyxoid fibroma of bone, Clin. Radiology, 33: 671-679, 1982. 8) Teitelbaum SL: Twenty years' experience with intrinsic tumors of the bony thorax at a large institution, J Thorac. Cardiovasc. Surg., 63: 776-783, 1972. 9) Turcotte B, Pugh DG, Dahlin DC: The roentogenologic aspects of chondromyxoid fibroma of bone, Am. J. Roentogenol., 87: 1085-1095, 1963. 10) Yamazaki Y, Sawaguti S, Ohkawa H, et al: Chondromyxoid fibroma of the chest wall in a infant, Jap. J. Surg., 11: 460-463, 1981. 11) Goorwitch J: Chondromyxoid fibroma of rib; Report of an unusual benign primary tumor, Dis Chest, 20 : 186-193, 1951. 12) Klein GM: Chondromyxoid fibroma: An unusual location, Clin. Orthopeadics Related Res. 164: 249-251, 1982. 13) Iwata S, Coley B: Report of six cases of chodromyxoid fibroma of bone, Surg. Gynecol. Obstet., 107: 571-576, 1958.

A case of chondromyxoid fibroma of the rib Ryoichi Kato, MD1,3), Y oshimi Maenaka, MD1), Hisami Iri, MD2) 1 Department of Surgery, Saiseikai Kanagawaken Hospital, Yokohama, Japan 2. Division of Surgical Pathology, Clinical Laboratories, Keio University School of Medicine, Tokyo, Japan 3. Presently Department of Surgery, Keio University School of Medicine. Tokyo, Japan A 6-year-old boy was referred to our hospital because of a tumor of the right seventh rib. On chest roentgenograms the tumor was seen as a translucent area with bulging of the eroded cortex. CT scan showed a small calcified area within the tumor: the CT number of the tumor was 28. Bone scintigraphy showed accumulation of 99mTC in the tumor. Tumor vessels and pooling of the contrast medium were seen on right seventh intercostal arteriography. The right seventh rib was resected with the anterior serratus muscle, periosteum of the sixth and eighth ribs and parietal pleura which were in contact with the tumor. The pathological diagnosis was chondromyxoid fibroma. Chondromyxoid fibroma is a rather rare benign bone tumor which seldom involves the ribs. The patient is well and healthy two and a holf years after the operation.