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Contrast-enhanced US with Levovist for the diagnosis of hepatic hemangioma: time-related changes of enhancement appearance and the hemodynamic background.

BACKGROUNDS/AIMS: To elucidate the diagnostic confidence of contrast-enhanced ultrasound (CEUS) with Levovist for hepatic hemangioma.

METHODOLOGY: The subjects were 34 patients with 38 hemangiomas and 12 patients with 15 hypervascular hepatocellular carcinomas. The early-phase (15-60 second) and liver-specific phase (after 5 min) were observed by the first injection. The 2nd injection was done for solo-phase method to observe liver-specific phase images without taking early-phase sonograms. The 3rd injection was done for changing posture method to observe liver-specific sonograms under left lateral ducubitus position.

RESULTS: In the early-phase of hemangioma, nodular enhancement (NE) was found transiently in 13 lesions (34%) and continuously in 25 lesions (66%), while hepatocellular carcinoma (HCC, n = 15) did not show this pattern. Intratumoral arterioportal shunt was closely related to the short duration of NE. Two enhancement patterns were observed in the liver-specific phase of hemangioma, diffuse in 12 lesions (31%) and partial in 26 lesions (69%), which were dependent on the early-phase enhancement. Liver-specific findings were also affected by taking early-phase sonograms or changing the posture of the patient. This method provided sensitivity of 79% and specificity of 100% for the diagnosis of hemangioma.

CONCLUSIONS: CEUS with Levovist may be promising method for the diagnosis of hepatic hemangioma.

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