Most common cause of Aortic dissection -

More than 90% of dissections occur in men between the age of 40 and 60 with antecedent hypertension. Other causes of dissection. Marfan syndrome causing cystic medial necrosis (second most common). Ehlers - Danlos syndrome. Inflammatory aortitis → Takayasu's disease, Giant cell arteritis. Coarctation of aorta. Normal woman during third trimester of pregnancy. Congenital bicuspid aortic valve.