Aneurysmal dilatation and progressive enlargement of one of the sinuses of Valsalva, most often occurs on the site of right coronary sinus and normally goes undetected during life until its rupture. Rarely, the aneurysm presents with evidence of obstruction of the right ventricular outflow tract, aortic insufficiency, conduction abnormalities, or coronary artery compression in the absence of rupture. The biggest size in the literature of aneurysm was reported as 8 cm. In this case report, we present successful surgical repair of 10 cm large sinus of Valsalva aneurysm with Bentall procedure.