肝局灶性结节样增生的CT和MR诊断（附8例报告）

目的分析肝局灶性结节样增生（FNH）的CT、MR表现水平,旨在提高对FNH的诊断。方法收集经病理检查证实的FNH8例、行CT检查7例、行MR检查2例,同时行CT和MR检查1例,并复习有关文献,探讨其CT,MR表现。结果CT平扫病灶呈均匀或不均匀的低密度,增强扫描动脉期除中央瘢痕外,所有病灶均明显强化,门脉期呈稍高密度,延迟期4个病灶呈稍高或等密度,3个病灶呈稍低密度;3个病灶的中央瘢痕均延时增强。MR平扫病灶呈稍长或等T1、T2信号;增强动脉期示病灶明显增强,门脉期及延时期呈稍高或等信号,病灶的中央瘢痕延时增强。结论CT、MRI,尤其是动态增强扫描对FNH的诊断具有重要价值。

CT and MR diagnosis of focal nodular hyperplasia of liver(with 8 cases report)

Objective To evaluate the MR imaging and CT appearance of focal nodular hyperplasia(FNH)of the liver and improve the accuracy of diagnosis in FNH.Methods The CT and MRI findings of 8 patients pathologically confirmed FNH were studied retrospectively.7 patients were examined by CT and 2 patients were examined by MRI.1 patient had both CT and MRI examination.Results On plain CT,the lesions showed heterogeneous or homogeneous hypodensity.On postcontrast CT,the lesions showed intense and homogeneous enhancement during arterial phase,except for 3 lesions with the central scar.During portal vein phase,the lesions showed moderate hyperdensity.During delayed phase,4 leisons remained mild hyperdensity or isodensity and 3 leisons showed hypodensity.3 lesions with central scars demonstrated delayed enhancement.On MR imageing,the lesion showed slightly long or iso-T1 and T2 signal intensity,demonstrating intense arterial enchancement and moderate portal and delayed enhancement on Gd-DTPA contrast studies.Central scar delayed enhancement.Conclusion MR and CT especially dynamic contrast enhancement is of great value to the diagnosis of FNH.