Eustachian valve

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Related to Eustachian valve: thebesian valve
(Anat.) a crescent-shaped fold of the lining membrane of the heart at the entrance of the vena cava inferior. It directs the blood towards the left auricle in the fetus, but is rudimentary and functionless in the adult.

See also: Eustachian

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Transthoracic echocardiography (TTE) and also transesophageal echocardiography (TEE) showed normal left and right ventricular size and function, mild pulmonary hypertension (systolic pulmonary artery pressure, 37 mm Hg), and dense echogenicity on the Eustachian valve of the inferior vena cava in the right atrium and a worm-like, highly mobile echogenicity (5 x 0.
Normally, the valve regresses by approximately 12 weeks gestation and leaves behind the crista terminalis superiorly and the eustachian valve of the inferior vena cava and the thebesian valve of the coronary sinus inferiorly.
This structure begins to regress during the second trimester leaving four remnants: the Eustachian valve (EV), the Thebesian valve, Chiari network and the terminal crest.