肝脏局灶性结节增生影像分析

目的 :分析肝脏局灶性结节增生 (FNH )的CT、MR及DSA表现 ,提高对本病的认识。方法 :6例经证实的FNH ,均行CT、MR及DSA检查。结果 :6例病灶CT平扫低密度者 4例 ,均匀或不均匀 ,2例为等密度。增强动脉期所有病灶均有明显强化 ,除中心瘢痕外病灶强化均匀一致 ,3例可见到中心或周边增粗、扭曲的动脉。门脉期和延迟期扫描 4例病灶为等密度 ,2例为略高密度。 3例伴有中心瘢痕 ,1例无强化 ,2例延迟强化。 2例行DSA检查 ,病灶内分布较均匀的新生血管团。MR检查 4例 ,T1 WI呈等信号或略低信号 ,T2 WI呈略高信号。 1例行Gd DTPA增强延迟期呈略高信号 ,中心瘢痕无明显强化。结论 :CT、MR及DSA检查可充分反映FNH的血供特点和病理特征 ,动态增强是诊断FNH最有效的影像学手段 ,在诊断和鉴别诊断中具有很大价值

Imaging analysis of focal nodular hyperplasia of liver

Objective:To investigate imaging features of focal nodular hyperplasia (FNH) of liver using CT,MR and DSA. Methods:Six patients with FHN proved pathologically underwent CT scanning,MR imaging and DSA.Results:On plain CT scans,4 of 6 cases showed homogeneous or inhomogeneous hypodensity,and the remaining two showed isodensity.On the arterial phase of contrast enhanced scans,all lesions enhanced dramatically and homogeneously,except the central scar.Tortuous and dilated arteries were seen at the center or peripheral area in 3 cases.On the portal and delayed phase scans,4 cases appeared isodense and 2 remained slightly hyperdense.Central scar was found in 3 cases and it showed no enhancement in 1,and enhancement in delayed phase in 2 cases.2 of 6 cases underwent DSA and they showed neovascularization within the lesion.4 cases underwent MR imaging,the lesions showed iso or hypo intensity on T 1WI and slightly hyperintensity on T 2WI,as well as slightly hyperintensity with no obvious enhancement in central scar with administration of Gd DTPA in 1 case.Conclusion:CT,MR and DSA play important role in the demonstration of blood supply and pathological features of FNH,dynamic contrast enhancement has great value in the diagnosis and differential diagnosis of FNH.