"expanded in ectasia, aneurysm or hypertension"
"other causes include cardiac aneurysm, pericardial cyst, coronary artery aneurysm, mediastinal tumour, pericardial defect, sinus of Valsalva aneurysm, and dilated right ventricular outflow tract"
"The right cardiomediastinal border is relatively smooth; the right atrium forms the right heart border, convexity at the right tracheobronchial angle is formed by the azygos vein, and a dilated or tortuous ascending aorta can displace the superior vena cava in a long arc."
"History and etymology"