Abdominal aortic aneurysm was detected in 269 patients and 26 (9.6%) of them had a coincidental malignancy. There were 25 (96.2%) men and 1 (3.8%) woman of age from 46 to 88 years (on the average 67.9 +/- 1.7 years old). All of them had different accompanying diseases, influencing the choice of treatment strategy. More than half of patients (16 (61.5%) had the advanced stage III or IV (3H) of cancer and three of them occupied the first place due to their wide occurrence: tumors of lung--42.3%, of stomach--19.2%, of large intestine--11.5%. The operations were performed in 8 patients with malignancy and in 2 patients with abdominal aortic aneurysm. Two-step operations were performed in 4 patients, the simultant operation--in one patient.