American Journal of Roentgenology, Vol 169, 125-130, Copyright © 1997 by American Roentgen Ray Society

ARTICLES

Hepatic lesion characterization in cirrhosis: significance of arterial hypervascularity on dual-phase helical CT

HM Lee, DS Lu, RM Krasny, R Busuttil, B Kadell and J Lucas
Department of Radiological Sciences, UCLA Medical Center 90095, USA.

OBJECTIVE: Our goal was to evaluate the diagnostic significance of the presence and pattern of arterial hypervascularity in lesions detected on dual-phase helical CT in cirrhotic patients. MATERIALS AND METHODS: Fifty-eight lesions greater than 1 cm in size were prospectively identified in 26 patients with end-stage liver disease who had undergone dual-phase helical CT for preoperative liver transplantation evaluation. All 26 patients had diagnoses proven by histologic evaluation or by clinical criteria. All arterial phase scans were retrospectively reviewed and lesions were categorized for the presence and pattern of arterial hypervascularity. Radiologic findings were correlated with histopathologic data. RESULTS: Thirty-seven of the 58 lesions had hypervascular components on arterial phase scans. All 37 of these lesions were found to represent hepatocellular carcinoma (HCC) (positive predictive value, 100%). Of the 21 remaining hypovascular lesions, 17 were HCC and four were benign (positive predictive value, 81%). Of the nine patients in whom all lesions were hypovascular, six had HCC (positive predictive value, 66%). The value of the presence of arterial hypervascularity for diagnosing HCC was statistically significant (p < .05). However, the presence or absence of arterial hypervascularity and the specific enhancement pattern revealed by helical CT did not correlate with histologic grading. CONCLUSION: The presence of hypervascularity in hepatic masses found in cirrhotic patients is highly predictive of malignancy.
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