MRI动态增强扫描在肝脏炎性假瘤诊断中的应用

Magnetic resonance imaging findings of liver inflammatory pseudotumor

目的探讨磁共振成像(MRI)平扫及动态增强扫描在肝脏炎性假瘤(IPL)诊断中的应用价值。方法回顾性分析经临床病理证实的12例肝脏炎性假瘤的MRI表现,并与病理进行对照。结果术前诊断良性病变10例,2例误诊为恶性肿瘤,其中诊断为炎性假瘤者7例。T1WI上5例为等信号,6例为低信号。T2WI上3例呈低信号,5例呈略高信号,3例呈等信号。多期动态扫描:动脉期均未见明显强化,在静脉期及平衡期可见不同程度强化,强化方式多样,偏心性或周边不均匀环行强化,或呈间隔样强化,强化持续时间较长。结论MR诊断IPL具有一定的特异性,结合病史,MR平扫及动态增强扫描,可以对肝脏炎性假瘤做出诊断。

Objective To evaluate the diagnostic value of MR imaging for inflammatory pseudotumor of liver （ IPL）. Methods The MR imaging features of 12 IPL cases proved by pathology were retrospectively reviewed and correlated with pathologic findings. Results Ten cases were diagnosed as benign lesions and two cases mistakenly as malignant tumors. Five were isointense and six were hypointense on T1WI,Three were hypointense and five were hyperintense and there were isointense on T2WI. None of 12 IPLs showed strong enhancement during arterial phase, and moderate enhancement during portal venous phase and delayed phase. The model of enhancement was multiplicity. Slight peripheral and eccentricity enhancement during portal venous was detected in IPL. There was a few spacing in enhancemental region and enhancemental time was longer. Conclusion The MR imaging findings of IPL were specific and it is possible that most of IPL can be diagnosed combining case history.