Focal Nodular Hyperplasia: Central Scar Enhancement Pattern Using Gadoxetate Disodium

Purpose: To illustrate the unusual enhancement pattern of the focal nodular hyperplasia central scar using Gadoxetate Disodium. Materials and Methods: Over a 10-month period, six patients, with a total of seven focal nodular hyperplasia lesions with typical central scar, had MRI of the liver using Gadoxetate Disodium (Eovist, Bayer Health Care Pharmaceuticals Inc., Wayne. NJ). Four of the six patients had a prior Gadobenate Dimeglumine (Multihance, Bracco Diagnostics Inc.. Princeton. NJ) -enhanced MRI of the liver performed within the previous year. The dynamic enhancement pattern of the central scar on the 10 liver MRIs was independently analyzed by two abdominal imaging radiologists who were blinded to the contrast agent used. Results: On the Gadoxetate Disodium-enhanced MRIs and during the arterial phase, 1-min, 2-min, and 3-min delay, none of the central scars demonstrated enhancement. However, all four of the lesions that were previously scanned using Gadobenate Dimeglumine demonstrated typical enhancement after a 3-min delay. Conclusion: On Gadoxetate Disodium-enhanced MRIs of the liver, the central scar of focal nodular hyperplasia lesions does not typically demonstrate delayed enhancement.