期刊
AMERICAN JOURNAL OF ROENTGENOLOGY
卷 196, 期 4, 页码 824-830出版社
AMER ROENTGEN RAY SOC
DOI: 10.2214/AJR.10.5113
关键词
contrast enhancement; gadoxetate disodium; hemangioma; liver; MRI
资金
- Kawasaki Medical School [21-109]
OBJECTIVE. The aim of this retrospective study was to assess the enhancement patterns of hepatic hemangiomas on gadoxetate disodium. MATERIALS AND METHODS. A total of 22 patients with 32 hepatic hemangiomas (23 typical type and nine high-flow type) in normal liver underwent gadoxetate disodium-enhanced MRI. Contrast-enhanced images were obtained before and after contrast injection, including arterial phase, portal phase, equilibrium phase, and three hepatobiliary phases (10, 15 and 20 minutes). Signal-to-phantom ratios of hemangiomas and the portal vein as well as lesion-to-liver contrast-to-phantom ratios were assessed. RESULTS. Mean signal-to-phantom ratios of all 32 hemangiomas showed the highest value on the arterial phase and subsequently decreased over time (p = 0.029 to p < 0.001). Mean lesion-to-liver contrast-to-phantom ratios of all 32 hemangiomas showed a positive value during the arterial phase and increasingly negative values at later time points (p = 0.001 to p < 0.001). The enhancement pattern of hemangiomas was equal to that of the portal vein at all time points. There was no significant difference in signal-to-phantom ratio between typical hemangiomas and high-flow hemangiomas at any time point. CONCLUSION. Most hepatic hemangiomas showed hypointensity relative to surrounding liver parenchyma during the equilibrium phase and the hepatobiliary phase. In addition, hepatic hemangiomas showed a signal intensity matching the portal vein at all phases, a finding we believe may be characteristic for hepatic hemangiomas on gadoxetate disodium-enhanced MR images.
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