We experienced 2 cases of abdominal aortic aneurysm (AAA) with malignant tumor of urinary organs. Case 1 was a 70-year-old man who was admitted for aortic dissection (De Bakey IIIb) with coexistence of AAA and left renal cancer. After the pseudolumen of the aortic dissection became thrombotic, the abdominal aortic aneurysmectomy and left nephrectomy were performed simultaneously. Case 2 was a 75-year-old man with AAA and prostatic cancer. He was treated by a one-stage operation consisting of aneurysmectomy, prostatectomy and castration. The postoperative courses were uneventful without prosthetic graft infection. Chemohormonal therapy could be induced one month after the operations. Concomitant resection of urinary malignant tumor and abdominal aortic aneurysmectomy may be feasible even in older patients.