Abstract: Objective The aim of this study was to analyze the clinical and imaging feature in patients with focal nodular hyperplasia of the liver (FNH) . Methods A total of 96 patients with FNH were encountered in our hospital between March 2020 and March 2023, and all underwent color Doppler ultrasonography, computed tomography (CT) and magnetic resonance imaging (MRI). The diagnosis was made based on histo-pathological examinations. Results Among the 96 patients with FNH, the upper abdominal fullness and discomfort was found in 19 cases (19.8%), hepatitis B carriers in 8 cases (8.3%) , serum alpha-fetoprotein (AFP) negative in 95 cases (99.0%) and slightly elevated in 1 case (1.0%), slight serum alanine aminotransferase and/or aspartate aminotransferase level elevation in 14 cases (14.6%) ; the pathological examination diagnosed typical FNH in 86 cases (89.6%) and non-typical FNH in 10 cases (10.4%); the abdominal color Doppler ultrasonography showed most of the lesions with clear boundaries, low echo area in 79 cases, even echo in 13 cases, high echo in 4 cases, and abundant blood flow signals in 57 cases; the CT imaging showed that there were slightly low-density or isodensity or uniform density nodules, with clear boundary from the surrounding liver parenchyma, and uniform enhancement at arterial phase in 83 cases, and without enhancement in 13 cases; out of the 38 patients underwent upper abdominal MRI scan, showed equal or low signals of the lesions on T1WI, equal or high signals on T2WI, with clear boundaries, and the lesions were obviously enhanced at arterial phase, equal or slightly high signals at portal venous phase and reduced enhancement at delayed phase. Conclusion There is a lack of specific clinical and imaging manifestations in most patients with FNH, and the biopsies or even direct surgery might be the optimal choice at this scenario.

Key words: Focal nodular hyperplasia of the liver, Ultrasonography, Computed tomography, Magnetic resonance imaging, Diagnosis