Safety & Efficacy of Ischemic Preconditioning by Embolization of the Inferior Mesenteric Artery in Surgery for Tumors of Lower and Middle Rectum

Inclusion Criteria: * Patients with rectal cancer eligible for surgery with ligation at the origin of the inferior mesenteric artery. * Patients with free, informed consent. * Patients affiliated to or benefiting from a health insurance plan. Exclusion Criteria: * Patients with a history of colon cancer who has undergone colon resection surgery * Patients with occlusion of the superior mesenteric artery or stenosis of more than 50%, visible on the CT scan performed as part of conventional management during extension workup. * Patients with occlusion of the IMA on the extension scan. * Patients with a systemic disorder responsible for haemostasis (haemophilia, Willebrand's disease, thrombocytopenia) and on anticoagulant therapy. * Patients taking corticosteroids or immunosuppressants leading to an unacceptable surgical risk. * Patients with renal insufficiency with clearance \< 30mL/min. * Patients with an allergy to iodine. * Patients who has had treatment of the abdominal aorta or its branches. * Patients participating in an interventional study. * Patients in an exclusion period determined by another study. * Patients under court protection, guardianship or curatorship. * Patients unable to give consent. * Patients for whom it is impossible to provide informed information. * Pregnant or breast-feeding patients.