Aim: To examine the influence of previous episodes of uncomplicated diverticulitis on the prognosis of patients who subsequently develop complicated diverticulitis. Patients: One hundred and fifty patients with previous episodes of diverticulitis who were admitted to the Mayo Clinic (Rochester, MN, USA) with complicated diverticulitis (perforation, abscess, obstruction, phlegmon, fistula, or bleeding). Design: The retrospective analysis was based on two groups of patients: group A had one or two prior episodes of diverticulitis ( n = 118) and group B had more than two prior episodes of diverticulitis ( n = 32). Measurement of outcome: The following criteria were used: phlegmon was a symptomatic inflammatory mass separate from and not associated with a purulent fluid collection; pericolic abscess was a collection of purulent mat
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