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International Journal of Hepatology
Volume 2013 (2013), Article ID 374170, 20 pages
http://dx.doi.org/10.1155/2013/374170
Review Article

MR Imaging of Hepatocellular Adenomas and Differential Diagnosis Dilemma

1Department of Radiology, Spedali Civili, 25100 Brescia, Italy
2Department of Radiology, Istituti Ospitalieri di Cremona, 26100 Cremona, Italy
3Department of Radiology, University of Brescia, Spedali Civili, 25100 Brescia, Italy

Received 4 November 2012; Accepted 24 January 2013

Academic Editor: Paulette Bioulac-Sage

Copyright © 2013 Luigi Grazioli et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Hepatocellular adenomas (HCAs) are currently categorized into distinct genetic and pathologic subtypes as follows: inflammatory hepatocellular adenoma, hepatocyte-nuclear-factor-1-alpha (HNF-1α-mutated) hepatocellular adenoma, and β-catenin-mutated hepatocellular adenomas; the fourth, defined as unclassified subtype, encompasses HCAs without any genetic abnormalities. This classification has accepted management implications due to different risks of haemorrhage and malignant transformation of the four subtypes. Imaging guided biopsy and/or surgical resection very important in obtaining definitive characterization; nevertheless, MRI with intra-extravascular and hepatobiliary (dual phase) agents, is an important tool not only in differential subtypes definition but even in surveillance with early identification of complications and discovery of some signs of HCA malignant degeneration. Inflammation, abnormal rich vascularisation, peliotic areas, and abundant fatty infiltration are pathologic findings differently present in the HCA subtypes and they may be detected by multiparametric MRI approach. Lesion enlargement and heterogeneity of signal intensity and of contrast enhancement are signs to be considered in malignant transformation. The purpose of this paper is to present the state of the art of MRI in the diagnosis of HCA and subtype characterization, with particular regard to morphologic and functional information available with dual phase contrast agents, and to discuss differential diagnosis with the most common benign and malignant lesions mimicking HCAs.