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Colonic diverticulitis in children: A retrospective study of 16 patients. BACKGROUND: Pediatric colonic diverticulitis (CD) is a rare entity. This study aimed to investigate the clinical features of CD in children. METHODS: We performed a retrospective chart review of children aged ≤15 years who were diagnosed with CD in our institution from May 2006 to November 2016. RESULTS: Sixteen patients were diagnosed with CD. All CD cases were observed to be solitary cecal diverticulitis; 14 cases were detected using ultrasound and the other two cases were diagnosed by computed tomography. Five patients were male (31.3%), and the median age was 12 years (range, 8-15 years). Initial symptoms were fever (temperature >38°C) in six (37.5%) patients, right lower quadrant abdominal pain in 16 (100%), anorexia in eight (50%), and nausea / vomiting in five (31.3%). A patient experienced persistent constipation; however, diarrhea was not observed as a clinical symptom in any patient. The median duration from symptom onset to admission was 1 day (range, 0-4 days), and the median length of hospital stay was 6 days (range, 4-10 days). All CD cases were treated with intravenous antibiotics. The median follow-up period was 90 months (range, 37-163 months), and during this period, recurrence of CD was observed in three (18.8%) patients. At recurrence, antibiotics were administered in all cases. CONCLUSIONS: In this study, all cases of CD were solitary cecal diverticulitis, and ultrasound was useful for the diagnosis of cecal diverticulitis in children. Non-operative treatment should be recommended as an initial treatment for CD in children.