Purpose : To assess the postoperative CT findings of aortic aneurysms or dissections treared byresection-and-graft replacement or continuous-suture graft-inclusion technique Materials and Methods : We reviewedpostoperative follow-up CT findings of 14 patients, 19 cases. There were 8 patients(10 cases) of aortic aneurysmand 6 patients(9 cases) of aortic dissecton which involved the thoracic aorta in 9 patients(13 cases) andabdominal aorta in 5 patients(6 cases). The interval of follow-up after operation was from 9 days to 2 year 9months. On CT scans, we analyzed the appearance of graft materials, differences of CT findings between twosurgical techniques, and normal or abnormal postoperative CT findings. Results : Most of grafts appeared ashyperdense ring on precontrast scan, and all of them were not seperated from aortic lumen on postcontrast scan. OnCT findings of patient who were operated by continuous-suture graft-inclusion technique, perigraft thrombus wasconcentrically located with sharp demarcation by native aortic wall and its density was homogeneous, but in casesof those operated by resection-and-graft replacement, perigraft hematoma was eccentrically located with indistinctmargin and its density was heterogeneous and native aortic wall could not be delineated. In patients withoutcomplication, perigraft thrombus or hematoma(15 cases), perigraft calcification(11 cases), residual intimal flap(6cases), graft deformity(4 cases), perigraft air(2 cases) and reconstructed vessels(1 case) are noted. And in onepatient with complication, perigraft flow was noted with more increased perigraft hematoma. Conclusion : Preciseknowledge of the differences of CT findings between two surgical techniques and normal postoperative CT findingsis crucial to evaluate the postoperative CT findings in aortic aneurysm and dissection.