Imaging manifestations of focal nodular hyperplasia of the liver
QIU Ganbin1 LIAO Weixiong1 WEN Zhongyan2 LIU Yonghui2 CHEN Jincan2▲
1.Department of Medical Imaging, Zhaoqing Medical College, Guangdong Province, Zhaoqing 526040, China;
2.Department of Radiology, the First People’s Hospital of Zhaoqing, Guangdong Province, Zhaoqing 526020, China
Abstract：Objective To investigate the CT and MRI imaging manifestations of focal nodal hyperplasia (FNH) of the liver. Methods The clinical and imaging data of 27 patients with FNH confirmed by surgery and pathology in the First People’s Hospital of Zhaoqing and the Affiliated Hospital of Zhaoqing Medical College from February 2015 to October 2020 were analyzed, and their imaging manifestations were analyzed. Results CT and MRI of typical FNH patients showed central fiber scar of the lesion with high signal intensity on T2WI. In contrast-enhanced arterial phase, the lesion was significantly enhanced except fibrous scar, while in delayed phase, contrast agent filling was found in fibrous scar. Atypical FNH showed various imaging manifestations, CT scan showed low density, large blood supply arteries in or around the enhanced artery lesions, rich “radial” vessels of different thickness in portal phase and delayed phase lesions, and the strengthening mode was “central flowering”. MRI showed low signal on T1WI and high signal on T2WI. The enhancement mode of contrast-enhanced scan was basically the same as that of CT. Conclusion The CT and MRI findings of typical FNH have certain characteristics and are not difficult to diagnose clinically; however, atypical FNH can be steatosis and has no “central fibrous scar”, so it is still difficult to accurately diagnose atypical FNH in clinical work. The “central flowering” enhancement in CT and MRI may help to improve the diagnostic rate of atypical FNH.
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