Results of diagnostic examination. (A) Long-axis view on preoperative transthoracic echocardiography showing moderate or severe mitral regurgitation. (B) Preoperative multidetector-row computed tomography. The RCA and the LCA were dilated, and collaterals between the two coronary arteries were observed. (C) Preoperative axial image obtained via enhanced computed tomography. The arrow indicates the RCA orifice, and the double arrows indicate the LCA orifice. The LCA originated from the PA. The orifice of the LCA was located 1.8 cm from the Ao. Ao, aorta; PA, pulmonary artery; RCA, right coronary artery; LCA, left coronary artery.