Anastomotic leakage is the major postoperative complication in right colectomy. Evaluation of calcification on coeliac trunk and mesenteric arteries on the preoperative CT scan could allow the identification of patient at-risk of postoperative complications.

A monocentric retrospective study performed at CHD Vendée concluded than a calcification score over or equal to 3 was associated with a higher risk of developping an anastomotic leakage.

The aim of this prospective multicentric study is to validate a calcification score based on preoperative CT scan analysis and focussing at coeliac trunk and mesenteric arteries.This study will involve patients operated on with a scheduled right colectomy.

Inclusion Criteria:

• Age ≥ 18 years old
• Scheduled right colectomy with restoration of digestive continuity
• Patient who has had or will have a preoperative abdominal-pelvic CT scan with or without contrast injection
• Patient with the ability to understand the protocol and agree to participate in the study.
• Affiliated with a social security system

Exclusion Criteria:

• Patient requiring a right colectomy or ileocaecal resection for chronic inflammatory bowel disease or on long-term corticosteroid therapy
• Patient with a history of colic resection
• Patient under guardianship, curatorship, or deprived of liberty
• Pregnant, postpartum or breastfeeding women
• Minor patients

Patient admitted for right colectomy in one of the 6 hospitals or clinics.