title: Suspected anastomotic recurrence of Crohn disease after ileocolic resection: evaluation with CT enteroclysis.
abstract: OBJECTIVE
  To determine the utility of computed tomographic (CT) enteroclysis for characterization of the status of the anastomotic site in patients with Crohn disease who had previously undergone ileocolic resection.
  
  
  METHODS
  Written informed consent was prospectively obtained from all patients, and the institutional review board approved the study protocol. CT enteroclysis findings in 40 patients with Crohn disease who had previously undergone ileocolic resection were evaluated independently by two readers. Endoscopic findings, histopathologic findings, and/or the Crohn disease activity index was the reference standard. Interobserver agreement between the two readers was calculated with kappa statistics. Associations between CT enteroclysis findings and anastomotic site status were assessed at univariate analysis. The sensitivity, specificity, and accuracy of CT enteroclysis, with corresponding 95% confidence intervals (CIs), for the diagnosis of normal versus abnormal anastomosis and the diagnosis of anastomotic recurrence versus fibrostenosis were estimated.
  
  
  RESULTS
  Interobserver agreement regarding CT enteroclysis criteria was good to perfect (kappa = 0.72-1.00). At univariate analysis, stratification and anastomotic wall thickening were the two most discriminating variables in the differentiation between normal and abnormal anastomoses (P < .001). Stratification (P < .001) and the comb sign (P = .026) were the two most discriminating variables in the differentiation between anastomotic recurrence and fibrostenosis. In the diagnosis of anastomotic recurrence, severe anastomotic stenosis was the most sensitive finding (95% [20 of 21 patients]; 95% CI: 76.18%, 99.88%), both comb sign and stratification had 95% specificity (18 of 19 patients; 95% CI: 73.97%, 99.87%), and stratification was the most accurate finding (92% [37 of 40 patients]; 95% CI: 79.61%, 98.43%). In the diagnosis of fibrostenosis, both severe anastomotic stenosis and anastomotic wall thickening were 100% sensitive (eight of eight patients; 95% CI: 63.06%, 100.00%), and using an association among five categorical variables, including severe anastomotic stenosis, anastomotic wall thickening with normal or mild mucosal enhancement, absence of comb sign, and absence of fistula, yielded 88% sensitivity (seven of eight patients; 95% CI: 47.35%, 99.68%), 97% specificity (31 of 32 patients; 95% CI: 83.78%, 99.92%), and 95% accuracy (38 of 40 patients; 95% CI: 83.08%, 99.39%).
  
  
  CONCLUSIONS
  CT enteroclysis yields objective and relatively specific morphologic criteria that help differentiate between recurrent disease and fibrostenosis at the anastomotic site after ileocolic resection for Crohn disease.
  
  
  BACKGROUND
  http://radiology.rsna.org/lookup/suppl/doi:10.1148/radiol.09091165/-/DC1.
authors.affiliation: Departments of Abdominal and Interventional Imaging and Digestive Diseases, Lariboisière-AP-HP-GHU Nord and Diderot-Paris 7 University, 2 rue Ambroise Paré, 75475 Paris cedex 10, France. philippe.soyer@lrb.aphp.fr
authors.forename: Philippe
authors.initials: P
authors.lastname: Soyer
authors.forename: Mourad
authors.initials: M
authors.lastname: Boudiaf
authors.forename: Marc
authors.initials: M
authors.lastname: Sirol
authors.forename: Xavier
authors.initials: X
authors.lastname: Dray
authors.forename: Mounir
authors.initials: M
authors.lastname: Aout
authors.forename: Florent
authors.initials: F
authors.lastname: Duchat
authors.forename: Kouroche
authors.initials: K
authors.lastname: Vahedi
authors.forename: Yann
authors.initials: Y
authors.lastname: Fargeaudou
authors.forename: Sophie
authors.initials: S
authors.lastname: Martin-Grivaud
authors.forename: Lounis
authors.initials: L
authors.lastname: Hamzi
authors.forename: Eric
authors.initials: E
authors.lastname: Vicaut
authors.forename: Roland
authors.initials: R
authors.lastname: Rymer
mesh_terms: D000328:Adult; D000368:Aged; D000704:Analysis of Variance; D000714:Anastomosis, Surgical / Q000009:adverse effects*; D003424:Crohn Disease / Q000000981:diagnostic imaging* / Q000473:pathology; D005260:Female; D006801:Humans; D007082:Ileum / Q000601:surgery; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D011857:Radiographic Image Interpretation, Computer-Assisted; D012008:Recurrence; D012680:Sensitivity and Specificity; D014057:Tomography, X-Ray Computed / Q000379:methods*