肝局灶性结节增生的MRI表现

目的 对肝局灶性结节增生(FNH)的MRI表现进行分析和总结，以提高对FNH MRI表现的认识。资料与方法 经手术病理证实的FNH18例，24个病灶，均作快速多层面扰相梯度回波(FMPSPGR)动态增强，11例作SET1WI、PDWI及T2WI，7例作SET1WI及FSET2WI。结果 24个病灶中，2个有典型中心瘢痕，9个有不典型中心瘢痕；动脉期明显强化23个；门脉期7个明显强化，15个中度强化，中心线样或点状强化6个；平衡期16个病灶中度强化，8个轻度强化，中心线样或点状强化2个；延迟期17个病灶，12个轻度强化，5个与肝实质等信号，4个有中心线样或点状强化。结论 MRI可对多数FNH(83．3％)作出正确诊断，对不典型FNH应结合病史及SPIO或Gd-EOB-DTPA动态扫描综合判断。

MRI Manifestations of Focal Nodular Hyperplasia of the Liver

Objective To analyze MRI features of focal nodular hyperplasia (FNH) of the liver, and to make a further understanding of FNH. Materials and Methods Dynamic contrast-enhanced FMPSPGR was performed in 18 patients with pathologically proved FNH (total 24 lesions). SE T 1WI, PDWI and T 2WI were completed in 11 cases, and SE T 1WI and FSE T 2WI in 7 cases.Results Of 24 lesions, central scar, the typical sign of FNH, was found in 2, while atypical central scar was seen in 9. Marked enhancement during arterial phase was demonstrated in 23, and during portal phase in 7 lesions. Moderate enhancement was seen in 15 lesions. During balanced phase, 16 lesions showed moderate enhancement and 8 lesions had mild enhancement. During delayed phase, 12 of 17 lesions showed mild enhancement and the other 5 lesions showed iso-signal, central linear or spotted enhancement was seen in 4 lesions.Conclusion Correct diagnosis of FNH , up to 83.3%, can be made by MRI. For atypical FNH, SPIO or Gd-EOB-DTPA enhanced dynamic scanning should be used and clinical material should be taken into account.