This study focuses on a single group of adult patients with chronic renal failure who are all awaiting a kidney transplant, whether or not they are treated by extra-renal purification.

These patients are contraindicated for transplantation due to their anatomical constraints: major arterial calcifications, iliac dissections, iliac stenoses and They can only receive the kidney transplant after arterial preparation.

It concerns all patients with chronic renal failure awaiting a kidney transplant, and presenting a contraindication to the transplant due to their anatomical constraints: major arterial calcifications, iliac dissections, iliac stenoses. They can only receive the kidney transplant after arterial preparation. These patients will be included and will benefit from endovascular preparation for the kidney transplant using a tailor-made arterial stent.

Imaging examinations and follow-up clinical data will be analyzed. Reinterventions and causes of death will be analyzed.

An information sheet will be given to patients; if the patient refuses the use of their data, it will not be collected.

Data collection will be carried out by ARCs or PIs of the centers from medical records. The data will be pseudo-anonymized, entered into a REDCAP database shared between each center.

The success of arterial preparation for renal transplantation will be evaluated by:

• Collect safety estimators, absence of serious complications (hemorrhage, acute/subacute ischemia of the lower limb, death, serious post-operative cardiorespiratory event, failure of renal function for non-dialysis patients) Validity at 1 month of an endovascular preparation for renal transplantation by tailor-made arterial stent by the success of the installation, the absence of endoleak and the good anteroposterior positioning of the stent
• Effectiveness at 1 month of endovascular preparation for renal transplantation by tailor-made arterial stent by permeability confirmed by Doppler ultrasound