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Sonazoid-Enhanced Ultrasonography for Diagnosis of Hepatic Malignancies: Comparison with Contrast-Enhanced CT

Objective: The purpose of this study was to assess the usefulness of Sonazoid-enhanced ultrasonography (US) in the diagnosis of hepatic malignancies in comparison with contrast-enhanced CT findings. Methods: A total of 74 patients with 113 hepatic tumors having or highly suspected of having malignancies were enrolled. These hepatic nodules were diagnosed by typical findings of imaging such as contrast-enhanced CT, dynamic MRI or Sonazoid-enhanced US, tumor markers and histological examinations after surgical resection or biopsy. Results: 108 nodules were diagnosed as malignant tumors (hepatocellular carcinoma: n = 90; metastasis: n = 16; intrahepatic cholangiocarcinoma: n = 2) and the remaining five tumors were diagnosed as benign tumors (dysplastic nodules: n = 5). Sonazoid-enhanced US correctly depicted the presence or absence of tumors in 74 patients, with a sensitivity of 95.4%, an accuracy of 94.7%, and a positive predictive rate of 99%. Contrast-enhanced CT depicted the malignancies with a sensitivity of 85.2%, an accuracy of 82.3%, and a positive predictive rate of 95.8%. There were significant differences between Sonazoid-enhanced US and contrast-enhanced CT for sensitivity and accuracy (both p < 0.05). Conclusion: Sonazoid-enhanced US has a higher sensitivity and accuracy for the diagnosis of hepatic malignancies than contrast-enhanced CT.