自身免疫性胰腺炎的MR诊断与鉴别诊断

MR diagnosis and differential diagnosis of Autoimmune pancreatitis

目的分析自身免疫性胰腺炎的MRI表现,旨在提高对其诊断的准确率。方法对经临床证实的10例自身免疫性胰腺炎进行回顾性分析,10例均行MR平扫及增强扫描检查。结果胰腺弥漫性受累(8/10),胰头局限性肿块(1/10),胰体尾部受累(1/10);6例可见"假包膜"征。MRCP:9例胆总管胰腺段狭窄,8例见胰管局限性或弥漫性狭窄,1例主胰管未见显示;动态增强后病变区呈延迟性强化。结论 MRI表现有一定的特点,需要和其它胰腺病变进行鉴别诊断,从而做出正确的诊断。

Objective To investigate the MR imaging findings of autoimmune pancreatitis （AIP）. in order to further improve its diagnosis of accuracy obviously. Methods The MR data of 10 patients with AIP clinically confirmed were retrospectively reviewed. Plain MR and dynamic contrast-enhanced MR scanning were performed on 10 patients. Results 8 patients showed diffuse swelling of the pancreas. 1 patient showed focal enlargement with hypoecho. 1 patient showed segmental enlargement of pancreatic body and tail. 6 patients showed psuedocapsule like around the pancreatic body and tail. MRCP： 9 patients showed irregular stenosis of distal common bile duct. 8 patients showed local and difusal stenosis of pancreatic duct. 1 patient showed pancreatic duct was invisible. Delay enhancement was found on dynamic contrast MR scan. Conclusion There is typical MR imaging features of AIP. AIP can be diagnosed corretly by differential diagnosis with other pancreatic disease.