胰腺导管内乳头状黏液瘤影像特征及误诊病例分析

目的 分析胰腺导管内乳头状黏液瘤(IPMN)影像学表现和误诊原因,减少误诊率.方法 回顾性分析术前影像诊断或怀疑为IPMN和术前影像误诊为胰腺其他疾病但是术后被确诊为IPMN患者的资料,共计130例.由2名高年资影像诊断医生统计资料,总结IPMN影像学表现,分析误诊原因,找出对策.结果 130例患者经病理确诊为IPMN有105例(80.7%),确诊为胰腺其他病变25例(19.2%);IPMN与慢性胰腺炎(CP)和浆液性囊腺瘤(SCN)间相互误诊病例最多.将IPMN按照病理级别分为轻至中度组和重度、浸润癌组,2组在囊肿直径、有无壁结节、有无分隔、主胰管直径、是否伴有肝内外胆管扩张组间有统计学差异(P<0.05).误诊的主要原因为影像科医生诊断时未完整结合患者的临床资料;对少见类型影像学表现认识不足;对于病变与胰管关系判断错误.结论 在诊断IPMN时需要结合病变临床特征,明确肿块与胰管之间的关系,全面掌握影像学表现;对于反复发作胰腺炎患者需考虑IPMN存在的可能;长期IPMN可以存在CP.

Imaging findings and misdiagnosis analysis of intraductal papillary mucinous neoplasm

Objective To analyze the imaging findings and misdiagnosis of intraductal papillary mucinous neoplasm (IPMN),to improve diagnosis level and decrease misdiagnosis rate.Methods The images of 130 patients were suspicion or diagnosis of IPMN, and the other pancreatic lesions but confirmed IPMN by pathology.Two radiologists collected materials, analyzed the reasons of misdiagnosis, and found out countermeasures.Results A total of 130 patients confirmed by pathology were available for analysis, in which there were 105 (80.7%) of IPMN, and 25 (19.2%) of other pancreatic lesions.The most misdiagnosed patients were between IPMN and chronic pancreatitis(CP),serous cystadenoma(SCN).All patients were divided into mild to moderate group and severe to infiltrating carcinoma group based on pathologic grades.There was significant difference between two groups in cystic diameter, wall nodule, separation and dilation, the diameter of main duct, and intra-or extrahepatic biliary tract(P<0.05).The most common causes of misdiagnosis included that the radiologists didn't combined with the patient's clinical features,and didn't reconstruct images or perform MRCP scan when the relationship between the lesions and the pancreatic duct was unclear.Conclusion It is important that the radiologists need to combine with the patient's clinical features, clear the relationship between the lesions and the pancreatic duct, and fully master imaging findings.The recurrent pancreatitis maybe result from IPMN, and IPMN for a long time would lead to CP.