Hepatic Masses: Differential Diagnosis with Two Phases Imaging by Using Spiral CT

ABSTRACT

PURPOSE: We compared the contrast enhancement patterns of hepatocellular carcinomas(HCC), hemangiomas, and metastasis on two phase imagings to determine the value of two phase dynamic CT in the differential diagnosis. MATERIALS AND METHODS: Two phases spiral volumetric CT scan were obtained 45 seconds and 6 minutes after bolus injection of contrast material in 106 patients. A bolus of 100 mL of nonionic contrast material was administered intravenously at a injection rate of 2 mL/sec. RESULT:In Hepatocollular carcinoma, 47% were totally hyperdense and 30% were totally hypodense in early phase, and 82% were totally hypodense in late phase. In hemangioma, 90% were peripherally hyperdense in early phase, 52% were isodense and 27% were totally hyperdense in late phase. In metastatic liver malignancies, 65% were hypodense and 32% were peripherally hyperdense in early phase, and 79% were hypodense in late phase. CONCLUSION: Two phases spiral volumetric CT scaning is considered to be heplful in the differential diagnosis of hepatic tumors.