Abstract
Objective
To determine whether Hidradenitis suppurativa (HS)-related anoperineal disease can be distinguished from Crohn’s disease (CD) using MRI.
Methods
Pelvic MRI of 23 HS and 46 CD patients with anoperineal disease between 2007 and 2014 were independently analysed by two radiologists. For diagnosis of HS, sensitivity, specificity and positive likelihood ratios (LRs) of inflammatory features and of their anatomical distribution were calculated and compared to those of CD.
Results
In HS, fistulae were less present (P = .033) and less frequently involved the sphincters (P = .001) than in CD. Granulomas were more frequent (P = .0005). For anterior/inguinal and posterior localizations, sensitivity, specificity and LR for diagnosis of HS were 70% (49.1, 84.4), 87% (74.3, 93.9), 5.3 (2.41, 11.79) and 57% (36.8, 74.4), 93% (82.5, 97.8), 8.67 (2.74, 27.41), respectively. Combination of signs including posterior involvement, absence of rectal wall thickening and bilaterality of features yielded specificity of 100% (95% CI: 92.3–100) for HS.
Conclusion
Although MRI presentations of anoperineal disease may overlap between CD and HS, specific diagnosis of HS is possible with a combination of three features: absence of features’ predominance in perianal area, absence of rectal wall thickening and bilaterality of features.
Key Points
• Spectrum of MRI features of HS-related anoperineal disease is wide.
• Specific diagnosis of HS-related anoperineal disease is possible using MR imaging.
• A combination of three MR signs allows distinction between HS and CD.
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Acknowledgements
The authors thank Dr. Luc Vandromme for his contribution to this research. The scientific guarantor of this publication is Prof. Christine Hoeffel. The 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. Written informed consent was waived by the Institutional Review Board. Institutional Review Board approval was obtained. Methodology: retrospective, diagnostic or prognostic study/observational, multicentre study
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Monnier, L., Dohan, A., Amara, N. et al. Anoperineal disease in Hidradenitis Suppurativa : MR imaging distinction from perianal Crohn’s disease. Eur Radiol 27, 4100–4109 (2017). https://doi.org/10.1007/s00330-017-4776-1
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DOI: https://doi.org/10.1007/s00330-017-4776-1