aortic aneurysm, familial thoracic 4 (MONDO_0007568) is any familial thoracic aortic aneurysm and aortic dissection in which the cause of the disease is a mutation in the MYH11 gene. Also known as: MYH11 familial thoracic aortic aneurysm and aortic dissection, aortic aneurysm, familial thoracic type 4, familial thoracic aortic aneurysm and aortic dissection caused by mutation in MYH11.