Inverted colonic diverticulum: An endoscopic examination and presentation

Objective We aimed to determine the frequency, morphological features, differential diagnosis, possible adverse events of inverted colonic diverticulum (ICD), which may be misdiagnosed as polyps. Methods In all, 810 patients who underwent a colonoscopy between April 2016 and November 2019 were included in the study, and their data were evaluated retrospectively. Colonoscopic procedures were performed at a single center by the same endoscopist. Results Among all the 810 patients, the prevalence of diverticulum was 29.58% (121/409) in men and 25.19% (n = 101/401) in women, respectively. ICD was observed in 1.73% (n = 14) of all patients, including 11 (78.57%) men (aged 63.2 ± 12.95 years [range 47–90 years]) and three women (60.3 ± 4.04 years [range 58–65 years]). Most (63.16% [12/19]) ICD lesions were localized in the sigmoid colon. And the diagnosis was confirmed by eversion using biopsy forceps in 78.95% of them. One patient developed perforation after polypectomy with hot biopsy forceps and was treated by surgical operation. Conclusions ICD is a common lesion that may lead to serious adverse events if misdiagnosed as polyps. Differential diagnosis of ICD is crucial during the colonoscopy.