Imaging analysis of focal nodular hyperplasia of liver

Objective: To evaluate the comprehensive imaging finding of focal nodular hyperplasia(FNH) of the liver. Methods: In 12 patients, 14 FNH lesions were confirmed pathologically. The imaging features(CT and MRI)were retrospectively reviewed and correlated with pathologic findings. Results: In 12 patients with 14 FNH lesions,on pre-contrast scans, 11 of 14 lesions were hypodense, the other three lesions were isodense. On the arterial phase scans, all lesions were markedly and hom-ogeneously enhanced. Central scar was found in four FNH lesions. On the portal phase and delayed phase scans, nine of 14 lesions turned to isodense,five lesions remained slightly hyperdense, one of four central scar showed late enhancement. Seven cases underwent MRI. The lesion showed iso or hypo-intensity on T1WI and slightly hyperintensity on T2WI. Conclusion: Multiphase helical CT or MRI scanning can fully reflect the pathologic features of FNH. Therefore, it is of great value in diagnosing FNH.