[Circular dissection of the ascending aorta with intimo-intimal invagination. CT diagnosis of a rare form of aortic dissection].

Intimointimal intussusception is a rare type of aortic dissection. The intimal tear occurs circumferentially with intussusception of the intimal flap downstream into the aortic arch causing obstruction of the great supraaortic vessels. A CT diagnosis has only once been reported. CT and angiographic findings of this rare complication of aortic dissection are described.