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Table 3 Köhler and Hansen/Stock classification.

From: Sigmoid diverticulitis: US findings

Köhler Classification Hansen/Stock classification
Symptomatic uncomplicated disease 0 Diverticulosis
Recurrent symptomatic disease I Acute uncomplicated diverticulitis
Complicated disease: II Acute complicated diverticulitis
Hemorrhage, Abscess, Phlegmon    a. Phlegmon, peridiverticulitis
Fistula, Perforation, Stricture    b. Abscess, sealed perforation
Purulent and fecal peritonitis, Small bowel    c. Free perforation
obstruction due to post-inflammatory adhesions III Chronic recurrent diverticulitis