title: Perianal infections: reader agreement and diagnostic performance of fat-suppressed contrast-enhanced MRI.
abstract: We aimed to determine the diagnostic performance of the contrast-enhanced fat-suppression technique in the detectability of perianal infections and to compare this technique with different MR sequences used for this purpose. Thirty consecutive patients with clinically suspected anorectal infections were examined with fast spin-echo (FSE) T2-weighted, short-inversion-time inversion recovery (STIR), and fat-suppressed and non-fat-suppressed T1-weighted spoiled gradient-echo (SGE) (in-phase) dynamic contrast-enhanced sequences. The results of MRI were correlated with the findings of surgery, which was considered as the standard of reference. Receiver-operating-characteristic curves were reconstructed to describe and compare the diagnostic value of each MR technique. The values of kappa were used as a measure of observer reliability. Diagnostic performances of STIR, FSE T2-weighted and fat-suppressed and non-fat-suppressed, contrast-enhanced SGE T1-weighted techniques showed statistically insignificant differences in detection of perianal infections. There was almost perfect interobserver agreement regarding the presence of lesions on each MR technique. Fat-suppressed, contrast-enhanced SGE T1-weighted MRI showed adequate diagnostic performance in the detection of perianal infections. However, its significance is not different from the other MR sequences used for the present study.
authors.affiliation: Department of Radiology, Ankara University, Medical School, Ankara, Turkey. ayse.erden@medicine.ankara.edu.tr
authors.forename: Ayşe
authors.initials: A
authors.lastname: Erden
authors.forename: Ethem
authors.initials: E
authors.lastname: Geçim
authors.forename: Suat
authors.initials: S
authors.lastname: Fitoz
authors.forename: Atilla H
authors.initials: AH
authors.lastname: Elhan
authors.forename: Ilhan
authors.initials: I
authors.lastname: Erden
authors.forename: Selma
authors.initials: S
authors.lastname: Tükel
mesh_terms: D000328:Adult; D000368:Aged; D001004:Anus Diseases / Q000175:diagnosis*; D001424:Bacterial Infections / Q000175:diagnosis*; D003287:Contrast Media; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008875:Middle Aged; D015588:Observer Variation; D012372:ROC Curve; D012002:Rectal Diseases / Q000175:diagnosis*; D012680:Sensitivity and Specificity
chemical_list: D003287:Contrast Media