Echocardiographic measurement of aortic root (AO) in parasternal long axis view: annulus, Valsalva sinuses, sinotubular junction and ascending aorta dimensions measured in a patient with Marfan syndrome. Measurements performed during systole, aortic annulus measured at the level of aortic leaflet hinge points. AO, aorta; LA, left atrium; LVOT, left ventricular outflow tract.