Abstract
Objectives
To assess the contrast-enhanced ultrasound (CEUS) frequencies of centrifugal enhancement, spoke-wheel sign and central scar in focal nodular hyperplasia (FNH) as a function of lesion size.
Methods
Ninety-four FNHs were retrospectively reviewed to assess their largest diameter and enhancement pattern, including centrifugal enhancement from one central artery, spoke-wheel sign, diffuse or centripetal enhancement, central scar and late-phase washout.
Results
Mean FNH-lesion size was 3.7 ± 2.1 cm. Only 43.6 % of FNHs had centrifugal enhancement, with a spoke-wheel pattern (23.4 %) or without (20.2 %), while 56.4 % showed diffuse or centripetal enhancement. Centrifugal enhancement was observed in 73.9 % of FNHs ≤3.1 cm and 14.6 % of FNHs >3.1 cm (P < 10–4). Size and frequency of centrifugal enhancement were negatively correlated (r = –0.57, P < 10–4). The spoke-wheel pattern was also seen more frequently in smaller (37 %) than in larger FNHs (10.4 %) (P < 10–3). Late-phase washout was described in 5.3 % of FNHs and was not size-dependent. Lesions with a central scar were larger than those without, respectively, 5.7 ± 1.7 and 3.6 ± 2.0 cm (P = 0.012).
Conclusions
Typical centrifugal enhancement yielding a confident FNH diagnosis is seen significantly more frequently when the lesion is ≤3.1 cm.
Key Points
• CEUS yields confident diagnoses of FNHs ≤3.1 cm
• The larger the FNH, the lower the diagnostic sensitivity of CEUS
• Final diagnosis of FNHs >3.1 cm should be obtained with MRI not CEUS
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Acknowledgments
The scientific guarantor of this publication is Oliver Lucidarme. The authors of this manuscript declare a relationship with the following company: Oliver Lucidarme is occasionally paid by Bracco Imaging France (the manufacturer of SonoVue) to organise teaching a session on contrast-enhanced imaging in liver. The other authors of this manuscript declare no relationships with any companies, whose products or services may be related to the subject matter of the article. The authors state that this work has not received any funding. One of the authors has significant statistical expertise (Mathilde Wagner) and no complex statistical methods were necessary for this paper. Institutional Review Board approval was not required because it is a retrospective study concerning the 10 past years. Written informed consent was not required for this study because it is a retrospective study concerning US exams that were regularly performed in clinical routine. In this case, an oral consent given by the patient is only required. None of the study subjects or cohorts has been previously reported.
Methodology: retrospective, diagnostic study/observational, multicentre study.
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Bertin, C., Egels, S., Wagner, M. et al. Contrast-enhanced ultrasound of focal nodular hyperplasia: a matter of size. Eur Radiol 24, 2561–2571 (2014). https://doi.org/10.1007/s00330-014-3280-0
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DOI: https://doi.org/10.1007/s00330-014-3280-0