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Table 2 European Association for Endoscopic Surgeons classification system for colonic diverticulitis (1999)

From: A historical review of surgery for peritonitis secondary to acute colonic diverticulitis: from Lockhart-Mummery to evidence-based medicine

Grade of disease Description Clinical state of the patient
I Symptomatic uncomplicated disease Pyrexia, abdominal pain, CT findings consistent with diverticulitis
II Recurrent symptomatic disease Recurrence of Grade I
III Complicated disease Bleeding, abscess formation, phlegmon, colonic perforation, purulent and fecal peritonitis, stricture, fistula and obstruction