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

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