[Acute type a aortic dissection operated in childhood; report of a case].

: A 12-year-old boy without any previous history and risk factors of cardiovascular disease presented to the emergency room with persisting general fatigue, bilateral shoulder pain and facial pallor. He was diagnosed as acute type A aortic dissection with cardiac tamponade by ultrasonic cardiogram (UCG) and computed tomography (CT) imaging, and the emergency surgery was indicated. He underwent hemiarch replacement because his aorta diameter was quite small but grafting as a large vascular prosthesis as possible was necessary in consideration of the growth. His postoperative course was uneventful and good, and he was discharged from our hospital in day 21 postoperatively. Acute aortic dissection in childhood is very rare but life-threatening. We should consider the particularity of children and make early diagnosis and treatment appropriately.