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通过分析３１例腹膜后肿瘤的ＣＴ表现，探讨ＣＴ对腹膜后肿瘤的定位及定性诊断价值，结果ＣＴ的定位准确率为９４％，良性与恶性肿瘤的大小无显著差异（Ｐ＞０．０５）。囊性肿瘤绝大多数为良性，仅一例巨大分化良好型平滑肌肉瘤为多房囊性肿瘤，囊实性及实性肿瘤在良恶性肿瘤中均可见。瘤体的钙化可见于畸胎瘤、血管内皮瘤、神经母细胞瘤和部分神经节细胞瘤，脂肪密度见于脂肪瘤或脂肪肉瘤。结论：ＣＴ具有较高的定位诊断价值，且可较好地显示肿瘤的内部情况，对定性诊断有一定帮助
By analyzing the CT findings of 31 cases of retroperitoneal tumor, the value of CT in the diagnosis and diagnosis of retroperitoneal tumor was discussed. Results The accuracy of CT was 94%. There was no significant difference between benign and malignant tumors (P> 0.05) . The vast majority of cystic tumors are benign, only a case of well-differentiated leiomyosarcoma of multiple large cystic tumors, cystic solid tumors and solid tumors are visible in both benign and malignant tumors. Tumor calcification can be found in teratoma, endothelium, hemangioblastoma and ganglioneurocytoma, fat density found in lipoma or liposarcoma. Conclusion: CT has a high value of localization diagnosis, and can better display the internal condition of the tumor, which will be helpful to the qualitative diagnosis