This is a report of 13 cases of surgically corrected ruptured aneurysm of the aortic sinus of Valsaha. The simultaneous trans-venous and trans-arterial catheterization and cineangiogram are the best diagnostic procedures. In 12 cases, the aneurysm originated from the right coronary sinus and only one from the noncoronary sinus. Eleven aneurysms ruptured into the right ventricle and 2 into the right atrium. Eight cases were associated with ventricular septa1 defect and 5 with aortic regurgitation. In three cases the Hancock porcine valve replacement was done. There was no surgical mortality.