肝脏局灶性结节增生的MRI和MSCT征象比较

目的：比较分析肝脏局灶性结节增生（FNH）的MRI、MSCT征象,以提高对FNH影像诊断水平。方法：回顾性分析13例经手术病理证实为FNH病例的影像资料,所有病例均行MRI、MSCT检查,且两种检查间隔时间为1个月以内。结果：12例为肝内单发病灶、1例为多发（2个）病灶。病灶中79%（11/14）MRI平扫T2WI为等或稍高信号,T1WI为等或稍低信号,21%（3/14）T2WI为高信号、T1WI为低信号;所有病灶（14/14）MSCT平扫均呈等或稍低密度;同时在显示病灶内部结构时MRI中79%（11/14）、MSCT中57%（8/14）见中央瘢痕或纤维分隔。MRI及MSCT两种检查方法的动态增强中,病灶表现为动脉期实质部分明显强化的比率MRI为100%（14/14）、MSCT为93%（13/14）;病灶周边或中央异常增粗、扭曲的血管影MRI为14%（2/14）、MSCT为43%（6/14）;病灶周边假包膜MRI为21%（3/14）、MSCT为7%（1/14）;所有病灶均表现出＂快进慢出＂强化方式;中央瘢痕延迟强化MRI为82%（9/11）、MSCT为63%（5/8）。结论：绝大多数FNH在MRI和MSCT上有特征性的征象,MRI对其中央瘢痕病理特征的显示优于MSCT,MSCT则在病灶周边或中央增粗、扭曲血管病理特征的显示上优于MRI。

Comparative analysis of MRI and MSCT features of focal nodular hyperplasia of liver

Objective：To compare the MR imaging and multi-slice spiral CT（MSCT） features of the focal nodular hyperplasia of liver（FNH）,and improve the accuracy of imaging diagnosis FNH.Methods：The CT and MRI findings were retrospectively analyzed in 13 cases of FNH.All the cases were confirmed pathologically and the interval between CT and MRI examinations were less than one month.Results：In all 13 cases,the lesions were mostly solitary（12/13） compared with 2 lesions in 1 case.Seventy-nine percent（11/14） of lesions appeared as equal to hyper intensity area on T1WI while slight hyper-intense on T2WI.Twenty-one percent（3/14） of lesions appeared as hypo-intensity on T1WI and hyper-intensity on T2WI.All lesions appeared as equal or low density area on non-contrast CT scan.The central scar or fiber separate construction were displayed among 79%（11/14） of lesions on MRI compared with 57%（8/14） on MSCT.The ratio of obvious enhancement in arterial phase on MRI was 100%,compared with that of 93%（13/14）on MSCT.Distorted arteries were displayed at the peripheral or central area in 43%（6/14） of lesions on MSCT,and 14%（2/14） on MRI.Pseudocapsule were found in 21%（3/14）lesions on MRI,and 7%（1/14） on MSCT.All lesions displayed the ＂rapid-filling in and slow-washout＂ enhancement model.The rate of delayed enhancement on central scar was 82%（9/11） on MR and 63%（5/8） on MSCT.Conclusion：Most FNH lesions had distinctive features on MRI and MSCT images.MRI was better than MSCT in revealing the pathologic features of central scar.To display the central or peripheral thickened and tortuous blood vessels in the lesions,MSCT was superior to MRI.