[Aortic Regurgitation due to Rupture of a Fibrous Strand in Fenestrated Aortic Valve:Report of a Case].

Fenestration of the aortic valve cusps rarely causes aortic regurgitation. A 54-year-old woman was diagnosed with aortic regurgitation secondary to a ruptured fibrous strand in a fenestrated aortic valve cusp. Diastolic murmur was pointed out during health checkup five months earlier, and transthoracic echocardiography revealed severe aortic valve regurgitation with a mobile mass attached to the aortic valve cusp.