• Michael Burns, Cameron J Hague, Patrick Vos, Pari Tiwari, and Sam M Wiseman.
• Department of Radiology, St Paul's Hospital & University of British Columbia, Vancouver, British Columbia, Canada. Electronic address: mdburns@me.com.
• Can Assoc Radiol J. 2017 Nov 1; 68 (4): 392-400.

PurposeThe objective of the study was to evaluate the performance of magnetic resonance imaging (MRI) for the diagnosis of appendicitis during pregnancy.MethodsWe conducted a retrospective review of all MRI scans performed at our institution, between 2006 and 2012, for the evaluation of suspected appendicitis in pregnant women. Details of the MRI scans performed were obtained from the radiology information system as well as details of any ultrasounds carried out for the same indication. Clinical and pathological data were obtained by retrospective chart review.ResultsThe study population comprised 63 patients, and 8 patients underwent a second MRI scan during the same pregnancy. A total of 71 MRI scans were reviewed. The appendix was identified on 40 scans (56.3%). Sensitivity of MRI was 75% and specificity was 100% for the diagnosis of appendicitis in pregnant women. When cases with right lower quadrant inflammatory fat stranding or focal fluid, without appendix visualization, were classified as positive for appendicitis, MRI sensitivity increased to 81.3% but specificity decreased to 96.4%.ConclusionsMRI is sensitive and highly specific for the diagnosis of appendicitis during pregnancy and should be considered as a first line imaging study for this clinical presentation.Copyright © 2017 Canadian Association of Radiologists. Published by Elsevier Inc. All rights reserved.

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