胰腺导管内乳头状黏液性肿瘤的MRI表现

MR Imaging Features of Pancreas Intraductal Papillary Mucinous Neoplasm

目的探讨胰腺导管内乳头状黏液性肿瘤(IPMN)的MRI特征。资料与方法6例经病理或逆行性胆胰管造影(ERCP)证实的胰腺IPMN患者。MR扫描包括T1WI、T2WI、MRCP和动态增强。分析胰腺IPMN的MRI征象,并与临床及病理对照。结果主胰管型、分支胰管型及混合型各2例,病灶主要位于胰头颈部,最大径(27.4±14.5)mm,呈分叶状,边缘清晰,T1WI上呈低信号,T2WI上呈高信号,增强后无强化或线状强化。2例病灶远端胰腺萎缩。2例分支胰管型主胰管最大径2.9 mm和2.2 mm,其余4例最大径(5.9±1.6)mm。结论MRI对发现和正确诊断胰腺IPMN有较高价值。

Objective To assess the MR imaging features of pancreas intraductal papillary mucinous neoplasm （IPMN）. Materials and Methods Six patients with IPMN proven by histopathology or ERCP underwent MR examination. The MR sequences included fast spoiled gradient echo （FSPGR） T1 weighted （T1W）, fast recovery fast spin echo （FRFSE） T2 weighted（ T2 W）, MRCP, and dynamic contrast-enhanced MR imaging. The MR imaging features of pancreat- ic IPMN were noted. Results IPMN in 6 patients showed as a cluster of cyst-like structures with a distinct rim in the head and neck of pancreas. The lesions were divided into main duct type in 2, branch duct type in 2 ,and combined type in 2. The mean and standard deviation of the maximum diameter of all IPMN was （27.4 ± 14.5） mm. All IPMN were hypointensity on T1 weighted images and hyperintensity on T： weighted images, with a thread like enhancement or no enhancement. The atrophy of pancreatic parenchyma was showed in 2 patients. The maximum diameter of main pancreatic duct in 2 pa- tients of branch duct type was 2.9 mm and 2.2 mm, respectively, and the maximum diameter of main pancreatic duct in oth- er 4 patients was （5.9 ± 1.6） mm. Conclusion MR imaging is very useful in the diagnosis of pancreas I PMN.