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01.04.2013 | Hepatobiliary-Pancreas

MR findings of steatotic focal nodular hyperplasia and comparison with other fatty tumours

verfasst von: Maxime Ronot, Valérie Paradis, Rafael Duran, Anne Kerbaol, Marie-Pierre Vullierme, Jacques Belghiti, Dominique-Charles Valla, Valérie Vilgrain

Erschienen in: European Radiology | Ausgabe 4/2013

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Abstract

Objectives

To correlate MR findings with pathology in steatotic FNHs and to compare the MR findings with those of other fatty tumours developed on noncirrhotic liver in a consecutive series of resected lesions.

Methods

Our population included resected FNH with intralesional steatosis (n = 25) and other resected fatty tumours selected as controls (hepatocellular adenomas and angiomyolipomas, n = 34). Lesions were classified into three groups: those with typical FNH without (group 1) or with (group 2) fat on MR and those with atypical lesions (group 3). In group 3, diagnostic criteria for other fatty tumours were applied.

Results

There were 9 lesions in group 1 (15.3 %), 4 in group 2 (16.8 %) and 46 in group 3 (77.9 %). Group 3 contained 12 FNHs (26 %) and all the other fatty tumours. In group 3, the association of lesion homogeneity, signal intensity similar to or slightly different from adjacent liver on in-phase T1- and T2-weighted sequences, and strong arterial enhancement was observed in 7/12 (58 %) of steatotic FNHs and 3/34 (9 %) of other tumours.

Conclusion

On MR, fat within a typical FNH should not reduce the diagnostic confidence. We recommend further investigations including liver biopsy if necessary when fatty tumours exhibit atypical MR findings.

Key Points

• MRI is increasingly used to assess hepatic lesions containing fat.

• Nodules of focal nodular hyperplasia often contain foci of fat.

• However, steatotic FNH does not always demonstrate typical fatty features on MRI.

• The main mimickers of steatotic FNHs are telangiectatic/inflammatory hepatocellular adenomas.

• We recommend liver biopsy when fatty tumours exhibit atypical MR findings.

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Titel: MR findings of steatotic focal nodular hyperplasia and comparison with other fatty tumours
verfasst von: Maxime Ronot
Valérie Paradis
Rafael Duran
Anne Kerbaol
Marie-Pierre Vullierme
Jacques Belghiti
Dominique-Charles Valla
Valérie Vilgrain
Publikationsdatum: 01.04.2013
Verlag: Springer-Verlag
Erschienen in: European Radiology / Ausgabe 4/2013
Print ISSN: 0938-7994
Elektronische ISSN: 1432-1084
DOI: https://doi.org/10.1007/s00330-012-2676-y

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MR findings of steatotic focal nodular hyperplasia and comparison with other fatty tumours