A 79-year-old woman presented with constipation and underwent polypectomy in 2009. She underwent colonoscopy annually thereafter. Pus, edema, and redness around diverticuli were observed in her sigmoid colon in 2012. Recurrence of ulcerations and scarring in her left-side colon was observed in 2014. Although her symptoms had not worsened, her sigmoid colon was strictured and she underwent left hemicolectomy in 2015. Histopathological examination revealed transmural deep fissures with non-specific inflammatory cell infiltration around them. No granuloma was detected. Relapse of colitis has not been seen since then. From her course, histopathological findings and endoscopic findings, diverticular colitis was diagnosed. Diverticular colitis is a non-specific chronic mucosal inflammation in a colonic segment with diverticuli. She has been taking aspirin for her comorbid heart disease and had a past history of polysurgery, which may have aggravated her disease course.
