Abstract
Objective
The purpose of this study was to evaluate enhancement characteristics of hepatocellular adenomas (HCAs) using gadoxetic acid as a hepatocyte-specific MR contrast agent.
Methods
Twenty-four patients with histopathologically proven HCAs were retrospectively identified. MRI consisted of T1- and T2-weighted (w) sequences with and without fat saturation (fs), multiphase dynamic T1-w images, and fs T1-w images during the hepatobiliary phase. Standard of reference was surgical resection (n = 19) or biopsy (n = 5). Images were analysed for morphology and contrast behaviour including signal intensity (SI) measurement on T1-w images normalised to the pre-contrast base line.
Results
In total 34 HCAs were evaluated. All HCAs showed enhancement in the arterial phase; 38 % of HCAs showed reduced contrast enhancement (“wash-out”) in the venous phase. All HCAs showed enhancement (SI increase, 56 ± 53 %; P <0.001) in the hepatobiliary phase, although liver uptake was stronger (96 ± 58 %). Thus, 31 of all HCAs (91 %) appeared hypointense to the surrounding liver in the hepatobiliary phase, while 3 out of 34 lesions were iso-/hyperintense.
Conclusions
Gadoxetic acid accumulates in HCAs in the hepatobiliary phase, although significantly less than in surrounding liver. Thus, HCA appears in the vast majority of cases as a hypointense lesion on hepatobiliary phase images.
Key Points
• Magnetic resonance-specific contrast agents are now available for hepatic imaging.
• Hepatocellular adenomas enhance with gadoxetic acid as in previous CT/MRI experience.
• Enhancement during the hepatobiliary phase is less in HCAs than in liver.
• Typical HCAs appear as hypointense lesions on T1-w hepatobiliary phase images.
• True hyperintense HCA enhancement can occasionally occur during the hepatobiliary phase.
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The data were presented at the ESGAR and RSNA in 2011.
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Denecke, T., Steffen, I.G., Agarwal, S. et al. Appearance of hepatocellular adenomas on gadoxetic acid-enhanced MRI. Eur Radiol 22, 1769–1775 (2012). https://doi.org/10.1007/s00330-012-2422-5
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DOI: https://doi.org/10.1007/s00330-012-2422-5