---

We present a 73 year-old severely ill Iranian patient who had a cardiac arrest and a successful cardiopulmonary resuscitation(CPR) one hour after admission in N.I.O.C Hospital. He was a known case of abdominal aortic aneurysm which was accidentally diagnosed by ultrasonography two years ago, so he was emergently operated with probable diagnosis of rupture of aneurysm. Meanwhile, he had a history of painless rectorrhagia unrelated to defecation during the past six months. Tissue diagnosis of rectal adenocarcinoma was defined following a total colonoscopy. Colorectal carcinoma and abdominal aortic aneurysm are common diseases in similar age group. Co-existence of these diseases is rare. Treatment strategy is a big challenge for these patients. In this patient, aneurysmectomy was performed first, because of emergent condition of the patient, and treatment of the colorectal carcinoma was postponed.