Pre-and Post-contrast Multiphase Helical CT and Pathological Analysis of An Compatine Analysis of MSCT and MRI with pathotogy of

Objective To analyze the CT and MRI findings of hepatic focal nodular hyperplasia(FNH),and to improve diagnosis accuracy of FNH.Methods The MSCT and MRI(6cases) findings were analyzed retrospectively in 18 patients(total 21 lesions) with FNH,which were approved surgically and pathologically.Results On plain CT scans,of 21 FNH lesions,lesions were homogeneous hypodense and14 lesions were inter-homogeneous hypodense.In the arterial phase,19 lesions were vigorously and homogeneously enhanced,1 lesions was much inter-homogeneously enhanced,and 1 lesions was slight and inter-homogeneously enhanced,except the central scar.Tortuous and dilated arteries were seen at the center or peripheral area in 6 of 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.Central scar was found in 7 lesions on unenhanced images and on dynamic contrast-enhanced images,15 lesions demonstrated late enhancement.MR images of 6 patients always showed appearance with slightly low intensity signal in T1-weighted images and isointensity or slightly hyper intensity signal in T2-weighted images.All lesions with markedly enhanced on the arterial phase and prolonged enhanced in the portal venous phase and delayed phase.Central scar was found in 4 lesions which demonstrated late enhancement.Conclusion MSCT and MRI scanning can fully show the pathologic and the blood supplying characteristics of FNH and improve to differentiate ability from other malignant hypervascular tumors.