Objective To explore the CT features of neurogenic tumors in retroperitoneum , in order to deepen the understand-ing and to improve the accuracy of preoperative diagnosis .Methods We analysed the CT features of 21 cases which were con-firmed by operation and pathology as retro-peritoneal neurogenic tumors , and then combined with the analysis of the literature for summarizing the imaging characteristics of neurogenic tumors in retro-peritoneum .All cases were performed with plain CT scan and contrast-enhanced CT scan , including 5 cases of sympathetic neurogenic tumor , nerve sheath tumors in 7 cases, and 10 cases of para-ganglioma.Results All 22 cases of retro-peritoneal neurogenic tumors were located in the adrenal area or along the distri -bution of sympathetic chain including 3 cases of ganglioneuroma within the sympathetic ganglion cells , and neuroblastoma , gan-glio-neuroblastoma all in 1 case;3 cases of benign schwannoma , 2 cases of malignant schwannoma , nerve fibroma in 2 cases, 4 cases of pheochromocytoma , 4 cases of benign Para-ganglioma and 2 cases of malignant Para-ganglioma.Among which Neuroblas-toma, ganglioneuroblastoma showed characteristics: showed apparently low density on CT plain scan , irregular in shape, the boundary was finishing and showed no enhancement or slight enhancement ; we can see the bulky and irregular calcification and the sign of vascular entrapment in retro-peritoneum.Para-ganglioma demonstrated as the most significantly enhanced , the clinical symptoms and laboratory examination had its own characteristics .Tumors originating from the nerve sheath showed great morpho-logical difference , the degree of enhancement situated between that two tumors .Conclusion Retro-peritoneal neurogenic tumors can be diagnosed accurately before operating more ofen according to the primary site , CT appearance , combined with the age of onset and clinical data of patients .%目的：探讨腹膜后神经源性肿瘤的CT表现，以加深对其认识，提高术前诊断准确率。方法分析22例经手术病理证实的腹膜后神经源性肿瘤的CT表现特点。并结合文献进行分析、总结腹膜后神经源性肿瘤的影像学特点。全部病例均进行了CT平扫和增强扫描，其中交感神经源性肿瘤5例，神经鞘膜来源肿瘤7例，副节瘤10例。结果22例腹膜后神经源性肿瘤均位于肾上腺区或沿交感神经链分布，其中交感神经节细胞来源的节细胞神经瘤3例，神经母细胞瘤及神经节神经母细胞瘤各1例；良性神经鞘瘤3例，恶性神经鞘瘤2例，神经纤维瘤2例，嗜铬细胞瘤4例，良性副节瘤4例，恶性副节瘤肿瘤2例。神经母细胞瘤和神经节神经母细胞瘤表现较具有特征性：平扫呈明显低密度，形态不规则，边界尚光整，增强扫描无明显强化或轻微强化；可见有较粗大无规则钙化及腹膜后大血管的包埋征象。副节瘤强化最显著，临床症状及实验室检查具有特征性，神经鞘来源的肿瘤形态差异较大，强化程度介于前两者之间。结论腹膜后神经源性肿瘤根据其好发部位、CT表现，结合患者发病年龄和临床资料，大多数在术前可作出较准确的诊断。
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