Diagnostic efficacy of gadoxetic acid-enhanced MRI for hepatocellular carcinoma and dysplastic nodule

AIM： To evaluate the relationship between the signal intensity of hepatobiliary phase images on gadoxetic acid-enhanced magnetic resonance imaging （MRI） and histological grade. METHODS： Fifty-nine patients with 82 hepatocellular lesions were evaluated retrospectively. Hepatobiliary phase images on gadoxetic acid-enhanced MRI were classified into 3 groups： low, iso or high. Angiographyassisted computed tomography （CT） findings were also classified into 3 groups： CT during arterial portography, and CT hepatic arteriography： A： iso, iso or low; B： slightly low, iso or low; and C： low, high. We correlated angiography-assisted CT, hepatobiliary phase findings during gadoxetic acid-enhanced MRI and histological grades. Furthermore, correlations between MRI find- ings and histological grade for each hemodynamic pattern were performed. Correlations among radiological and pathological findings were statistically evaluated using the chisquare test and Fisher＇ s exact test. RESULTS： There was a significant correlation between histological grade and hemodynamic pattern （P 〈 0.05）. There was a significant correlation between histological grade and signal intensity in the hepatobiliary phase （P 〈 0.05） in group A lesions. There was no significant correlation between histological grade and signal intensity in the hepatobiliary phase in group B or C lesions （P 〉 0.05）. CONCLUSION： Signal intensity in the hepatobiliary phase correlated with histological grade in the lesions that maintained portal blood flow, but did not correlate in lesions that showed decreased or defective portal blood flow.