Broader indications for renal transplantation and improved allograft survival suggest that aortic aneurysms will be encountered more commonly in kidney transplant recipients. This report describes the use of a temporary heparin-bonded shunt placed from the proximal abdominal aorta to the femoral artery for perfusion of a renal allograft during simultaneous repair of an aortic aneurysm and correction of transplant renal artery stenosis. Renal function was satisfactorily maintained intraoperatively and has continued to be excellent during 2 1/2 years of follow-up. Methods of renal transplant protection during aortic reconstruction are reviewed, and principles of temporary shunting for allograft protection are proposed.