Analysis of CT Manifestations of Hepatic Focal Nodular Hyperplasia with Pathologic Correlation

Objective:To analyze the CT manifestations of hepatic focal nodular hyperplasia(FNH) without and with multi-phase contrast enhancement,and to investigate its diagnostic value.Methods:CT images pre-and post-3-phase dynamic enhancement in 18 patients(21 lesions in total) with pathology proved FNH were analyzed retrospectively.Results:On plain CT scans,7 FNH lesions were homogeneously hypo-attenuated and 14 lesions were heterogeneously hypo-attenuated.In arterial phase,apart from the central scar,19 lesions were markedly and homogeneously enhanced;moderately and heterogeneously enhanced as well as slightly and heterogeneously enhanced could be assessed in one lesion each.Tortuous and enlarged arteries were seen at the center or periphery in 6 out of the 21 lesions.In the portal venous phase and delayed phase,10 lesions remained slightly hyperdense,6 lesions turned to isodense,and 5 lesions turned to slightly hypodense.Star shaped central scar was found in 7 lesions on unenhanced images and in 15 lesions on multi-phase contrast enhanced images,delayed enhancement was showed on equilibrium phase.Conclusion:The pathology and blood supply characteristics of FNH could be revealed by CT examination.The CT findings of FNH were hypo-attenuated on plain scan and fast in,delayed washout on enhanced images.