Echocardiography
The Eustachian valve is frequently seen with transthoracic echocardiography from the parasternal long axis, the apical four-chamber and the sub-costal four-chamber views. The Eustachian valve better seen with transesophageal echocardiography in the bi-caval view and right sided horizontal and longitudinal views.
Association between Eustachian valve and patent foramen ovale has been studied in patient with cryptogenic stroke.
Read more about this topic: Valve Of Inferior Vena Cava