Background: The purpose of this study is to assess mid- to long-term clinical results of the endoluminal stent-graft repair in patients with type B aortic dissection. Methods: Retrospective analysis was done on 72 patients (average age: 55짹12 yrs) who diagnosed as chronic type B aortic dissection and underwent stent-graft repair at Severance Cardiovascular center from June 1994 to December 2007. Procedural success as defined as the completion of the stent-graft deployment at the target area without stent or graft failure and Clinical success as defined as the complete obliteration or thrombosis of the false lumen during follow-up, were elucidated. Results: Procedural success was obtained in 70 patients (97%). Failure due to stent migration and tortuous anatomy was observed in 2 cases. There was an absence of immediate postprocedural mortality or paraplegia. Median follow-up duration was 43 months (5 ~ 97 months, 64.4짹38.8 months). Three patients were lost during follow up. Clinical success was achieved in 56 patients (84%). 18 patients (25%) demonstrated complications such as persistent type I endoleak, false lumen flow patency at distal portion of stent-graft, and 4 (6%) patients such as type II endoleak. Among these endoleaks, 9 patients were progressed and 9 patients were remained unchanged. There were unintended left subclavian artery occlusion (1 patient), transient acute renal failure (1 patient), saccular aneurysm (5 patients) and stent-graft migration or torsion (2 patients) as complications. During medial follow-up 43 months, 1 patient (1.4%) died. Conclusions: Intermediate to long-term results of stent graft implantation in patients with Type B aortic dissection is acceptable and stent graft implantation should become a first line therapy in these patients.