Experience with computerized tomography, used for the diagnosis of aortic aneurysm, is summarized. This diagnostic method is shown, on the basis of 137 cases, to be highly valuable for this pathology. The results of computerized tomography were compared to postoperative data, which demonstrated high accuracy in the measurement of the size of aortic aneurysm. Being a noninvasive diagnostic method that yields an accurate assessment of the aneurysm size, computerized tomography has advantages over other investigation methods. It is concluded that, unless a combined lesion of other vessels is suspected, preoperative investigation may be limited to computerized tomography alone.