胃肠道异位胰腺的CT表现

目的：分析胃肠道异位胰腺（EP）的CT表现，以提高对该病的认识。方法：回顾性分析11例经手术病理或内镜活检证实的胃肠道EP的CT资料，分析总结其特征表现。结果：11例均为单发病灶，位于胃窦小弯侧1例，胃体小弯侧6例，十二指肠3例，空肠1例。EP长径1．6～2．9CITI，短径0．9～1．6cm，长轴均与胃肠道壁平行。7例胃部EP均呈卵圆形；4例肠道EP中，1例呈卵圆形，3例形态不规则。9例边缘模糊，2例边缘清晰。CT平扫示EP密度较均匀，无囊变及坏死。4例显示表面脐凹征，2例中央见导管征。增强示EP均呈明显持续性强化，类似正常胰腺的强化方式。结论：胃肠道EP的长径大小、长轴方向、强化方式、脐凹征及导管征等CT表现具有一定的特征性，联合上述特征可提高该病的诊断水平。

CT features of upper gastrointestinal ectopic pancreas

Objective：To analyze the CT findings of ectopic pancreas （EP） in the upper gastrointestinal tract in order to determine the imaging significance of this unusual condition. Methods：A retrospective review of the CT findings was per- formed in a series of 11 patients with histologically verified EP in upper gastrointestinal tract （GIT）. The CT characteristics were analyzed and summarized. Results： All 11 cases were of single lesion. The EP locations were：lesser curvature of gastric antrum,1 ease;lesser curvature of gastric body, 6 cases; duodenum, 3 cases; and jejumum, 1 case. The major axes, which were found respect to the GI tract in all lesions,ranged from 1.6 to 2.9cm. All seven gastric EPs were ovoid in shape. A- mong the four intestinal lesions,one was ovoid;the other three were of irregular shape. The margins were ill-defined in 9 ca- ses and well-defined in 2 cases. In CT plain scan,EP showed homogeneous density without cystic degeneration or necrosis. A dimpling sign was found in 4 lesions,and central duct sign in 2 lesions on contrast enhanced scan. The heterotopic pancre- atic tissue was strongly and continuously enhanced in all cases, whose enhancement pattern was similar to the normal one. Conclusion：The CT features, such as size, direction of its major axis, enhancement pattern, dimpling sign and central duct sign,have certain useful characteristics and can be combined to improve the accuracy in the CT diagnosis of EP in upper gas- trointestinal tract.