肝泡型棘球蚴病MRI特征性征象分析

Analysis on the Characteristic Signs of MRI in the Liver Alveolar Hydatid Disease

目的探讨肝泡型棘球蚴病灶典型核磁共振成像(MRI)征象。方法分析53例经手术病理证实的肝泡型棘球蚴病患者术前病灶MRI征象,并与肝内其他类型病灶MRI征象进行比较。结果肝脏泡型棘球蚴病灶在MRI上具有的征象为:152例病灶实性部分在T2WI脂肪抑制序列(T2-SPAIR)呈均匀短T2信号,DWI序列上呈低信号;1例为等T2信号,DWI序列上呈等信号;53例病灶T1WI序列均呈等T1信号。2扩散加权成像(DWI)病灶外缘均有高信号影环绕。3增强扫描病灶外周带呈环形小网格状强化,其余部分未见明显强化。422例病灶实性部分内胆管及血管走行正常。5病灶坏死部分在DWI信号多样,以高信号显示居多。结论肝脏泡型棘球蚴病灶在MRI上具有特征性征象,MRI在诊断方面具有特异性。

Objective To discuss the typical MRI findings of liver lesions in alveolar hydatid disease. Methods To analyze MRI signs in 53 patients who had been received operation and pathologically confirmed as hepatic alveolar hydatid disease. We also compared them with other types of liver lesion＇s MRI findings. Results The signs of MRI showed in hepatic alveolar hydatid lesions were： 1Solid part of 52 lesions showed a homogeneous short T2 signal in T2-SPALR,presenting low sign on DWI sequence,1 lesions showed T2 equisignal,presenting equisignal on DWI sequence,53 lesions showed T1 equisignal on T1W1 sequence; 2There were high signal shadows around the outer edge of the DWI lesions; 3Small circular grating reinforcement showed in enhanced scan lesions,the rest of the lesions showed no enhancement; 4It showed normal shapes for bile duct and blood vessels in the solid part of22 lesions; 5DWI signals in necrotic focus were various and dominated by higher type of signal. Conclusion The characteristic of MRI signs show typical hepatic alveolar hydatid lesions so that MRI scanning owns a unique advantage in diagnosis for hepatic alveolar hydatid disease.