The aim of this study was to analyze the performance of Fuji Intelligent Color Enhancement (FICE) using the classification of Kudo in the differentiation of neoplastic and non-neoplastic raised lesions in ulcerative colitis (UC).
The Kudo classification of mucosal pit patterns is an aid for the differential diagnosis of colorectal polyps in the general population, but no systematic studies are available for all forms of raised lesions in UC.
All raised, polypoid and nonpolypoid, lesions found during consecutive surveillance colonoscopies with FICE for long-standing UC were included. In the primary prospective analysis, the Kudo classification was used to predict the histology by FICE. In a post hoc analysis, further endoscopic markers were also explored.
Two hundred and five lesions (mean size, 8 mm; range, 2 to 30 mm) from 59 patients (mean age, 56 y; range, 21 to 79 y) were analyzed. Twenty-three neoplastic (11%), 18 hyperplastic (9%), and 164 inflammatory (80%) lesions were found. Thirty-one lesions (15%), none of which were neoplastic, were unclassifiable according to Kudo. After logistic regression, a strong negative association resulted between endoscopic activity and neoplasia, whereas the presence of a fibrin cap was significantly associated with endoscopic activity. Using FICE, the sensitivity, specificity, and positive and negative likelihood ratios of the Kudo classification were 91%, 76%, 3.8, and 0.12, respectively. The corresponding values by adding the fibrin cap as a marker of inflammation were 91%, 93%, 13, and 0.10, respectively.
FICE can help to predict the histology of raised lesions in UC. A new classification of pit patterns, based on inflammatory markers, should be developed in the setting of UC to improve the diagnostic performance.
#2nd Division of Surgery, ASST Fatebenefratelli Sacco, “Luigi Sacco” University Hospital
§Endoscopy Unit, Fondazione IRCCS Istituto Nazionale dei Tumori
¶Chair of Statistics, University of Milan, Milan
†Digestive Endoscopy Unit, A.O. Istituti Ospitalieri, Cremona
∥Pathology Unit, A.O. Spedali Civili Brescia, Brescia, Italy
Presented in 2014 at the 9th Congress of the ECCO in Copenhagen.
The authors declare that they have nothing to disclose.
Address correspondence to: Andrea Cassinotti, MD, Gastroenterology Unit, ASST Fatebenefratelli Sacco, Luigi Sacco University Hospital, Via G.B. Grassi 74, Milan, Italy 20157 (e-mail: firstname.lastname@example.org).
Received December 19, 2016
Accepted October 3, 2017