肝局灶性结节增生的MRI动态增强与DSA影像表现

背景与目的:肝局灶性结节增生(focal nodular hyperplasia,FNH)是肝脏少见的良性肿瘤样病变,其影像学诊断仍有因难.本研究拟探讨FNH的MRI动态增强和数字减影血管造影(digital subtraction angiography,DSA)表现,以提高FNH影像学诊断水平.方法:回顾分析30例经病理证实的FNH的MRI和DSA影像资料.MRI检查26例,其中,平扫后普通增强扫描11例,动态增强扫描15例;DSA检查10例.结果:MRI动态增强扫描15例18个病灶动脉期呈显著强化,强化持续至延迟期仍高于或等于肝实质.11个病灶显示中央瘢痕.中央瘢痕在门脉期开始强化并持续至延迟期.动态增强时间-信号强度曲线18个病灶均为动脉期迅速升高,门脉期至延长期缓慢下降,呈速升-缓降型.DSA检查10例13个病灶表现为动脉血供丰富.8个病灶供血动脉分支进入病灶后呈辐射状向周围发散.结论:MRI动态增强扫描更能敏感显示FNH中央瘢痕组织信号.FNH的动态增强时间-信号强度曲线特征表现为速升-缓降型.FNH的DSA特征为供血动脉分支进入病灶后呈辐射状向周围发散.MRI动态增强和DSA检查可提高FNH诊断的准确率.

Dynamic Contrast-enhanced MR Imaging and Digital Subtraction Angiography Manifestation of Hepatic Focal Nodular Hyperplasia

BACKGROUND & OBJECTIVE:Focal nodular hyperplasia(FNH) is a rare benign hepatic tumor and its imaging diagnosis remains difficult.This study was to analyze dynamic contrast-enhanced MR imaging and digital subtraction angiography(DSA) manifestation of FNH,and to improve the diagnostic accuracy of FNH.METHODS:The MRI and DSA imaging data of 30 patients with FNH proved by pathology were reviewed.Conventional contrast-enhanced MRI was completed in 11 patients;dynamic contrast-enhanced MRI was completed in 15 pat...