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复习腹膜后间隙的正常断面解剖以及各种断面成像方法（ ＣＴ、ＢＵＳ、ＭＲＩ） 的检查技术、优点及局限性。了解原发腹膜后间隙肿瘤的影像表现。腹膜后间隙原发肿瘤十分罕见。在全身肿瘤中约占０ ．３ ％ —３ ％ ，其中间叶组织肿瘤约占２０ ％ —６０ ％ ，神经源肿瘤占１０ ％ —３０ ％ ，胚胎残余组织肿瘤占１０ ％ 。良性肿瘤４７ ．０２ ％ ，以神经源肿瘤居首位。恶性肿瘤占５２ ．９８ ％ ，以间叶组织肿瘤最多见。脂肪肉瘤、良性神经源肿瘤、畸胎类肿瘤、巨大淋巴结增生的影像表现有一定特征性。其他病理类型往往无特异性影像表现。影像检查应特别注意肿瘤与邻近大血管及重要器官结构的关系，为制定治疗方案提供信息。对疑为生殖细胞肿瘤的男性患者应注意血清肿瘤标记物的检查及睾丸的Ｂ 超扫描。疗后影像检查随诊对早期检出复发、及时治疗有重要意义。
Review the normal cross-sectional anatomy of the retroperitoneal space and the inspection techniques, advantages, and limitations of various cross-sectional imaging methods (CT, BUS, and MRI). Understand the image performance of primary retroperitoneal space tumors. The primary tumor in the retroperitoneal space is very rare. About 0 in the body tumor. 3% -3%, among which about 20% - 60% of the tumors of the mesenchymal tissue, 10% - 30% of the neurogenic tumors, and 10% of the residual tumors of the embryo. Benign tumor 47 . 20% of neurogenic tumors took the lead. Malignant tumors accounted for 52. 98% of the most common tissues were mesenchymal tumors. The imaging manifestations of liposarcoma, benign neurogenic tumors, teratoid tumors, and large lymph node hyperplasia have certain characteristics. Other pathological types often have no specific imaging. The imaging examination should pay particular attention to the relationship between the tumor and the adjacent major blood vessels and the structure of vital organs and provide information for the development of treatment plans. For male patients with suspected germ cell tumors, attention should be paid to examination of serum tumor markers and B-scan ultrasonography. Post-treatment imaging examinations are important for early detection of recurrence and timely treatment.