Objective To assess the MSCT imaging features of seminoma in intraabdominal undeseended testis , and to im-prove the diagnostic accuracy pre-operation .Methods Clinical datas and MSCT images of 15 cases of seminoma in abdominal testis collected from May 2010 to February 2016 and proved by pathology and surgery were analyzed .All of the 5 cases underwent plain and enhanced MSCT scanning .The MSCT features included tumor size , edge, density, enhanced pattern and supplying ar-tery.Results All cases presented abdominal pain or abdominal mass , and unilateral testicular was absent .The lesions were lo-cated in the abdominal and pelvic cavity , with maximum diameter ranged from 6.4~14.5 cm.All masses displayed clear realm and uneven density with cyst-solid mixed, and solid component was located in the edge with 12~25 HU increased.Thickened and tortuous testieular arteries were seen in 3 cases in the arterial phase .Conclusion The seminoma in intraabdominal undescended testis was rare .MSCT features had certain characteristics , and closely combined with clinical data would help to improve the level of preoperative diagnosis .%目的：探讨腹内型隐睾精原细胞瘤的MSCT表现特征，提高术前诊断水平。方法回顾性分析2010年5月～2016年2月在我院经手术病理证实的5例腹腔内型隐睾精原细胞瘤的临床资料和CT表现，所有患者均行平扫和增强扫描；CT指标包括肿瘤大小，界限、密度，强化方式和供血血管等。结果所有患者均表现为腹痛或腹部肿块，阴囊内单侧睾丸缺如。肿块均位于腹腔或盆腔内，最大直径约6．4～14．5 cm；病灶境界清楚，密度不均呈囊实性改变，实性成份位于肿块边缘。增强后均肿块呈不均匀强化，实性成分轻度强化，CT值增加约12～25 HU；3例可见增粗扭曲的睾丸动脉供血。结论腹腔内型隐睾精原细胞瘤罕见，MSCT表现具有一定特征性，同时紧密结合临床资料，有助于提高术前诊断水平。
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