Effect of Endovascular Inferior Mesenteric Artery Embolization on Colonic Perfusion Prior to Rectal Surgery for Rectal Tumor or Sigmoid Colon Surgery

Inclusion Criteria:

* The patient must have given their free and informed consent and signed the consent form
* The patient must be a member or beneficiary of a health insurance plan
* The patient is at least 18 years old and less than 80 years old
* Patient has rectal cancer or sigmoid colon cancer requiring surgical treatment

Exclusion Criteria:

* The subject is participating in another study, or is in a period of exclusion determined by a previous study
* The subject refuses to sign the consent
* It is impossible to give the subject informed information
* The patient is under safeguard of justice or state guardianship
* Patient has a history of abdominal surgery
* Patient suffers from a hemostasis disorder (hemophilia, von Willebrand disease, thrombocytopenia) and is on anticoagulant therapy.
* Patient whose general condition appears too precarious or is taking corticosteroids or immunosuppressants leading to an unacceptable surgical risk.
* Renal insufficiency with clearance \<45ml / min
* Known allergy to contrast media
* Patient who had treatment of the abdominal aorta or its branches Reported pregnancy (the existence of effective contraception will be verified for women of childbearing age).
* Anatomical variant at risk or absence of marginal artery highlighted at the time of arteriography.
* Abnormality of the superior mesenteric artery
* Historic occlusion of the inferior mesenteric artery