Abnormal aortic morphology Aortic dissection SNOMEDCT_US:308546005 HP:0002647 Tear in inner wall of large artery that carries blood away from heart HP:0002622 UMLS:C0340643 Aortic dissection refers to a tear in the intimal layer of the aorta causing a separation between the intima and the medial layers of the aorta.