Preoperative 2D echocardiography. (A) Long-axis view. Hypoplastic RV and PA arising from the posterior aspect of the CAT. (B) Four-chamber view. Normal atrial arrangement is noted. Ao: aorta; CAT: common arterial trunk; LA: left atrium; LV: left ventricle; PA: pulmonary artery; RA: right atrium; RV: right ventricle.