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Updated: Dec 5, 2025

Echocardiographic Evaluation of Atrial Communications before Transcatheter Closure
Published on: February 8, 2022
Giant Eustachian valve and Thebesian valve-A highly deceptive structures as atrial septal defect rims
Srinath Damodaran1, Krishna Prasad Gourav1, Sunder Negi1
1Department of Anaesthesia & Intensive Care, Postgraduate Institute of Medical Education and Research, Chandigarh, India.
Abstract:
The Eustachian valve (EV) of the inferior vena cava and the Thebesian valve (TV) of the coronary sinus are incompletely regressed structures of embryonic sinus venosus. In the majority of cases, the EV and TV disappear completely after birth or are represented only by a thin crescentic fold. On echocardiography, these vestiges may mimic abnormal structures. We report a case with giant EV and TV which were initially misinterpreted as rims of an atrial septal defect (ASD) leading to the false diagnosis of ostium secundum ASD.
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