[A case of nontraumatic rupture of ascending aorta].

A 34-year-old man became shock caused by nontraumatic ascending aortic rupture. He was urgently operated. The aortic annulus was mildly ectatic and right coronary cusp was aneurysmal but not perforated. There was a small laceration in the anterior aortic wall without dissection. Cabrol operation was performed.