Inclusion Criteria:  Patient whose age is ≥ 18 years Patient with a diagnosis of mechanical small bowel obstruction on CT performed between April 2014 and December 2019 Patient who had a CT scan with at least 3 phases: injection-free, arterial time, portal time French-speaking patient  Exclusion Criteria:  Patient who did not have surgery within the first 24 hours Patient with a history of abdomino-pelvic surgery in the month preceding the scan Patient under guardianship or curatorship Patient deprived of liberty Patient under court protection Patient who objects to the use of his or her data for this research