目的分析消化道异位胰腺的多 层螺旋CT(MDCT)表现，提高诊断的准确 性和鉴别诊断能力。方法 回顾性分析25 例经组织病理学证实的消化道异位胰腺 的MDCT资料，患者术前均行多排螺旋CT平 扫、三期增强扫描及三维重建，观察病灶 的位置、大小、长径与短径的比值、形 态、密度、强化方式、强化程度、生长方 式、病灶边界、病灶表面及周围粘膜情 况，总结该病的CT表现特点。结果 25例 均为单发病灶，9例(36%)发生在胃部，9 例(36%)在十二指肠，5例(20%)在空肠， 2例(8%)在回肠；大小为6mm-25mm；胃病 灶LD/SD>1.4的有7例(78%)；十二指肠病 灶LD/SD>1.4的有5例(55%)；空回肠病灶 LD/SD均为1.0。15例(60%)为类圆形，4例 为圆形，4例呈不规则形，2例表现为胃肠 壁局部增厚。11例(44%)起源于黏膜下及 肌层，21例(84%)累及黏膜下层。病灶平 扫密度均匀，增强扫描均呈持续性强化， 类似胰腺强化方式；13例(53%)病灶强化 程度与正常胰腺组织相仿；2例显示导管 征；20例(80%)病灶向腔内生长，18例 (72%)病灶边界欠清楚。结论 消化道异位 胰腺的CT表现具有一定特征性，熟悉其特 点可提高对该病的诊断水平。

Objective To analyze the multi-detector computed tomography (MDCT) features of ectopic pancreas in the gastrointestinal tract in order to improve the diagnostic accuracy of the disease. Methods CT findings were reviewed retrospectively in 25 cases with ectopic pancreas confirmed by surgery and pathology.All patients underwent plain CT, contrast-enhanced scanning with three phases and three dimensional reconstruction. Analyze the location, size, the long diameter (LD)/the short diameter(SD), shape, attenuation, contrast-enhancement pattern and grade of the lesions, growth pattern, border, as well as enhancement of the overlying mucosa. Results All 25 cases were of single lesion.9cases were in the gastric.9 cases were in the duodenum, 5 cases were in the jejunum, 2 cases were in the ileum. The max axes ranged from 6-25mm, 7 cases the LD/SD ratio is greater than 1.4 in gastric ectopic pancreas, 5 cases the LD/SD ratio is greater than 1.4 in duodenum. the LD/SD ratio of the jejunum and ileum lesion is 1.0. 15 cases were ovoid in shape, 4 cases were sphere, 4 cases were irregular shape, 2 cases were manifested as Localized thickening of the gastrointestinalwall. 11cases were located in the submucosa and muscularis.The ectopic pancreas was continuously enhanced in all cases，The contrast enhancement grade was similar to that of the normal pancreatic tissue in 13 cases. 2 case showed central duct sign. 20 cases were endoluminal growth pattern. Conclusion Gastrointestinal tract ectopic pancreas has certian MDCT charateristics. It can help us to improve the diagnostic ability of the disease to familiar with these features.