This study will include data collected from surgical units performing emergency surgery in Italy during 2024, with a one-year follow-up period for each patient. Data for each center will be prospectively collected through a database filled out by the Italian Society of Colorectal Surgery (SICCR) members who participate to the study. Specific data will include: WSES diverticulitis classification, procedure timing, laparoscopic/converted procedures, rate of performed protection ileostomies or colostomies, rate and timing of Hartmann reversal or stoma closure, procedures with more than two operators, procedures with expert first operator, night or weekend procedures, and patients aged over 80. Postoperative data will focus on complication rates and mortality at one, six, and twelve months.

Inclusion Criteria:

• 18 yo or older
• CT scan and WSES classification
• surgical intervention within 48 hours for acute diverticulitis

Exclusion Criteria:

• underaged
• conservative treatment for acute diverticulitis
• other treatment
• diagnosis of colorectal cancer at histology

general population