A rare form of aortic aneurysm that occurs in the sinus of Valsalva. An aneurysm is a thinning and bulging of a blood vessel wall. The condition is generally asymptomatic unless it burst and causes life-threatening complications including heart failure. An unruptured aneurysm may affect the blood flow (causing palpitations and syncope) as the bulge pushes against surrounding structures. See also Aneurysm of sinus of Valsalva