肝脓肿的MRI平扫及动态增强信号特征分析

目的：探讨肝脓肿的MRI平扫及动态增强扫描信号特点。方法：对临床及手术病理证实的21例肝脓肿患者MRI平扫及增强后动态扫描资料进行回顾性分析。结果：21例中,单发肝脓肿13例,多发8例,共39个主病灶,15个伴多发子灶。39个主病灶中,＂簇样征＂3个,蜂窝网格状、花边样征24个,＂环靶征＂12个。平扫示主病灶T1WI间隔及壁呈等低信号、脓腔低信号,T2WI间隔及壁略高信号、内脓腔呈更高信号;子病灶中央见点状T1WI低、T2WI高信号;20个主病灶周围见片状或肝段性T2WI高信号。增强后动态扫描：①动脉期肝脓肿27个主病灶分隔及边缘轻度强化,12个主病灶壁轻度强化、其中10个壁边缘明显强化;②门脉期分隔或/和壁强化逐渐明显、壁边缘持续强化,边界更加清晰;③延迟期（1～5min）分隔或/和壁持续强化。30min延迟扫描8个主病灶,壁内层仍见强化,壁边缘强化减退;④子病灶环边缘动脉期轻度强化、门脉期及延迟期强化逐渐明显;⑤主、子病灶坏死脓腔均无强化;⑥28个主病灶周围见片状或肝段性动脉期一过性强化。结论：MRI平扫及动态增强扫描能较好的显示肝脓肿的发生、演变、发展及转归过程,反映肝脓肿的特征表现。

Analysis of MRI Characteritics in plain and Gd-DTDA dynamic enhanced sign in hepatic abscesses

Objective:We did a retrospective study to analyze MRI characteristic and its utility in the diagnosis of hepatic abscesses. Methods:We retrospectively reviewed and analyzed MRI findings of liver abscesses in 21 patients confirmed clinically and pathologically. Results:Thirteen patients had a single lesion and 8 patients had multiple lesions,with a total of 39 liver abscesses.Of all abscesses,fifteen lesions were associated with satellite nodules,3 with cluster sign,24 with lace pattern and crest septum sign...