3.0T MRI在肝癌随访中检出新发微小癌灶的影像研究

The value of 3.0T MRI in detecting new micro-hepatocellular carcinoma during follow-up examination

目的:探讨3.0T MRI在肝癌随访中检出新发微小癌灶的价值。方法:对经治疗后并有病理证实的肝癌进行长期MR跟踪随访,采用3.0T MR平扫、DWI及动态增强(DCE)检查,对由病理和临床诊断的17例共23个新发的微小癌灶(MHCC)的MRI特点进行回顾性研究。结果:23个新发MHCC均<1.0 cm,在T2WI上为略高信号结节;小、大b值DWI高信号者分别为23个、19个;DCE显示富动脉血供结节21个,其中16个呈"快进快退",5个呈"快进慢退";乏血供结节2个,增强各期未见强化;10个结节(≥0.7 cm)在平衡期有"强化的假包膜征"。结论:3.0T MRI多种技术的联合使用在诊断新发MHCC方面有很高的应用价值。

Objective：To study the value of 3.0T MRI in finding new micro-hepatocellular carcinoma（MHCC） lesions during follow-up examination.Methods：Seventeen patients who were confirmed by pathology to be hepatocellular carcinoma and were follow-up by MRI for long term after treatment.All of these cases had conventional MRI,DWI and dynamic contrast enhance （DCE） MRI examination on a 3.0T MR system.Among them there were 23 newly found MHCC,these lesions were confirmed by clinical and short term follow-up.The MRI features of these lesions were studied retrospectively.Results：The 23 MHCC＜1.0 cm showed slightly high signal on T2WI,23 and 19 lesions showed high signal on small and large b value DWI respectively,21 lesions showed rich blood supply on DCE among these lesions,16 lesions showed the characteristic “fast in and fast out” feature,5 lesions showed “fast in and slow out” feature,lack of blood supply in 2 lesions which showed no enhancement on different phases of DCE,10 nodules （≥0.7 cm） showed pseudocapsule enhancement on equilibrium phase.Conclusion：Combination of different sequences using 3.0T MR system has important clinical application value in detecting newly appeared MHCC.