The prevalence of aneurysm in this study was 14.3%, with the majority of cases (50%) occurring following end-to-end repair. Surgical repair by Dacron patch aortoplasty is the most widely recognized technique associated with aneurysm formation, with a reported incidence of between 2% to 27% (5- 7,16). The “natural history” of aneurysm formation is unknown. Aneurysms have been reported to occur as early as three years, and as late as 18 years, following surgery (5,7,16). Aneurysm formation following end-to-end repair is unusual. Few other studies, however, have systematically examined patients after surgical repair of coarctation of the aorta, and most studies have targeted patients following patch aortoplasty repair. Given our results, more scrupulous follow-up of patients following end-to-end repair is advisable.