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目的：探讨ＣＴ对原发性腹膜后肿瘤的定位诊断价值。材料与方法：收集我院１１例经手术及病理证实的原发性腹膜后肿瘤的ＣＴ表现结果。１１例均做了增强前、后扫描。回顾性分析腹膜后肿瘤的病变特点。结果：根据腹膜后肿瘤的病理类型、解剖分布、病灶形态、大小及密度，病灶与周围器官、血管及周围脂肪间隙的关系，判断其来源部位。结论：ＣＴ检查能准确反映病变部位、范围及相邻结构的关系，判断肿瘤是否来自腹膜后组织，做到定位诊断准确。由于其病变缺少特异性，ＣＴ对其定性诊断有一定限度，但对其良、恶性判断有一定帮助，是术前必不可少的影像学检查手段
Objective: To investigate the diagnostic value of CT in the diagnosis of primary retroperitoneal tumors. Materials and Methods: CT findings of 11 cases of primary retroperitoneal tumor confirmed by surgery and pathology were collected. All 11 cases had enhanced front and back scans. Retrospective analysis of retroperitoneal tumor lesions. RESULTS: According to the pathological type, anatomical distribution, shape, size and density of retroperitoneal tumors, the relationship between lesions and surrounding organs, blood vessels and peripheral fat spaces, the source of the lesions was judged. Conclusion: CT examination can accurately reflect the location of the lesion, the scope and the relationship between adjacent structures, determine whether the tumor is from retroperitoneal tissue, so that accurate positioning diagnosis. Due to the lack of specificity of its lesions, CT has a certain limit on its qualitative diagnosis, but it is helpful for the judgment of benign and malignant diseases. It is an essential imaging examination method before surgery.