关键词: 磁共振成像, 体层摄影术, 自身免疫性胰腺炎

Abstract: ［Abstract］ Objective To investigate the imaging features of CT and MRI of autoimmune pancreatitis （AIP）and improve the preoperative diagnosis of the diseases. Methods CT and MRI imaging data of 45 patients with AIP proved by effective clinical hormone therapy and surgery were retrospectively reviewed. Changes in pancreas and surrounding tissues, pancreatic duct and bile duct were analyzed. CT and MRI imaging features of AIP were summarized. Results Among the 45 patients with AIP, 32 were males, 13 were females. 37 patients were appeared pancreas diffusely enlargement, 8 patients with segmental enlargement, and the density of pancreatic lesions in all 27 patients was reduced during CT examination. In the 16 cases of MRI, signal changes were observed in pancreatic lesions, showing low signal on T1WI and slightly high signal on T2WI. Delayed enhancement was observed in all 45 patients. Pancreatic duct stenosis appeared in 10 cases of CT and 7 cases of MRI, and common bile duct stenosis appeared in 2 cases of CT and 1 case of MRI. In 14 cases, “pseudo capsule sign”was found in CT and MRI. Conclusion CT and MRI of AIP have certain characteristics. Combined with laboratory examination, the diagnosis of AIP is helpful.

Key words: autoimmune pancreatitis, magnetic resonance imaging, tomography