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Colonoscopy after Hinchey I and II left-sided diverticulitis: utility or futility?

BACKGROUND: Modern 64- to 128-slice computed tomography (CT) scanners have questioned the need for routine colonoscopy after hospital admission for presumed uncomplicated diverticulitis.

METHODS: This is a retrospective review of all patients (>18 years) who underwent planned colonoscopy after admission for Hinchey I or II acute diverticulitis (January 2009 to January 2014). The findings on the final radiologist report were then correlated with the colonoscopy results.

RESULTS: In total, 110 patients (mean age, 55.2 ± 16; 46.4% female) underwent a subsequent colonoscopy (median, 60 days) after admission for diverticulitis. Overall, 102 patients (92.7%) had CT findings consistent with definitive diverticulitis, 6 patients had a diagnosis suggestive of diverticulitis on CT scan, and 2 patients had masses on their admission CT scans. Within the group with definitive diverticulitis, follow-up colonoscopy identified diverticulosis in 99 (97.0%), whereas the other 3 had normal findings. Of the patients with CT scans suggestive of diverticulitis, follow-up colonoscopy showed 3 with diverticulosis, 2 with malignancies, and 1 with nonspecific inflammation. The reliability of CT scans for diverticulitis compared with colonoscopy was found to have a kappa = .829 (P < .001; 95% confidence interval, .629, 1.21).

CONCLUSIONS: Follow-up colonoscopy should be performed when a CT scan suggests malignancy, nonspecific inflammatory findings, or the patient is otherwise due for routine screening or surveillance. In this study, there was no benefit of follow-up colonoscopy in patients with CT-confirmed diverticulitis in the absence of other concerning or indeterminate findings.

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