自身免疫性胰腺炎的影像学表现

Imaging Findings of Autoimmune Pancreatitis

目的:研究自身免疫性胰腺炎(AIP)的影像学特征。方法:回顾性分析15例符合2008亚洲诊断标准的AIP患者的CT和MRI影像学资料,总结胰腺及胰腺外的影像学表现。结果:10例AIP表现为胰腺弥漫性增大,5例AIP表现为胰腺局部肿大。病灶区在T1WI上信号明显降低,在T2WI上信号轻度升高,15例均见渐进性延迟强化,3例见"鞘膜征",9例AIP胆总管胰腺段的狭窄,3例ERCP均示胰管不规则狭窄,2例双肾多发节结影。结论:AIP具有一定特征性影像学表现;影像检查是诊断AIP的必要手段。

Objective：To investigate the radiologic characteristics of autoimmune pancreatitis（AIP）.Method： The radiological data of 15 AIP patients met the Asia diagnostic criteria of AIP in 2008 were retrospectively reviewed, the radiologic characteristics of extrapancreatic and intrapancreatic lesions was described.Result： CT and MRI showed diffuse swelling of the pancreas in 10 cases and focal enlargement in 5 cases. The swollen pancreas was hypointense on T1WI and mildly hyperintense on T2WI, 15 paitients appeared enhancement on delayed phase. A capsule-like rim was showed in 3 cases. Narrowing of the intrapancreatic portion of common bile duct were found in 9 cases, and ERCP showed diffuse and irregular narrowing of the main pancreatic duct in 3 cases. Low density nodular foci in double kidneys were seen in 2 cases. Conclusion： AIP has certain characteristics of typical imaging feature ,imaging examinations play an important roles in the diagnosis of AIP.