目的　分析骶骨原发性肿瘤的X线和CT表现。方法　回顾性分析经临床手术病理证实的 10例骶骨原发性肿瘤 ,其中脊索瘤 5例 ,骨巨细胞瘤 2例 ,软骨肉瘤 2例 ,神经鞘瘤 1例。结果　 (1)脊索瘤常累及S3～ 5,有中央性肿块 ,平片与CT为溶骨性骨质破坏 ,瘤内有残余骨嵴和钙化 ;(2 )骨巨细胞瘤常累及S1～ 3,呈膨胀性骨质破坏 ,好发于青年人 ;(3 )软骨肉瘤 ,神经鞘瘤X线和CT上各有特点。本组 1例软骨肉瘤从S1～ 3骨质破坏 ,并向盆腔内长出一巨大肿块。结论　X线平片与CT结合 ,有助于骶骨原发性肿瘤的诊断与鉴别诊断 Objective To analyze the X-ray and CT findings of sacral primary tumors. Methods Ten cases of sacral primary tumors confirmed by clinical pathology were retrospectively analyzed, including 5 cases of chordoma, 2 cases of giant cell tumor of bone, 2 cases of chondrosarcoma and 1 case of schwannoma. Results (1) Chordoma often involve S3 ~ 5, there are central mass, flat mass and CT are osteolytic bone destruction, residual bone ridge and calcification in the tumor. (2) Giant cell tumor of the bone often involves S1 ~ 3 , Was expansive bone destruction occurs in young people; (3) chondrosarcoma, Schwannoma X-ray and CT have their own characteristics. Chondrosarcoma in this group from 1 to 3 bone destruction, and the pelvis to grow a huge mass. Conclusion X-ray combined with CT is helpful for the diagnosis and differential diagnosis of sacral primary tumors