A National Study of Clinical Results After Emergency Operation for Perforated Diverticulitis

Inclusion Criteria: * All patients registered in the Patient registry with ICD 10 codes K57 classified as emergency admissions and with the Nordic Medico-Statistical Committee (NOMESCO) code JAH01(diagnostic laparoscopy), JFB46 (resection of sigmoid colon), JFB60 (resection of sigmoid colon, sigmoidostomy and closure of the distal stump), JFB61 (laparoscopic resection of sigmoid colon, sigmoidostomy and closure of the distal stump), JFB63 (other colon resection, colostomy and closure of the distal stump), JAK04 (laparoscopy and peritoneal lavage), JAW97 (other laparoscopic operation involving abdominal wall, mesentery, peritoneum or the omentum) Exclusion Criteria: * Patients where hospital records reveal that the index admission was misclassified (not perforated diverticulitis) will be excluded. * Patients classified as Hinchey 1-2. * No informed consent received or withdrawal of consent (questionnaire)