gastroesophageal vestibule

gas·tro·e·soph·a·ge·al ves·ti·bule

the dilated aboral portion of the esophagus, just above the cardiac orifice; usually, it corresponds to the lumen of abdominal part of the esophagus although its relation to the diaphragm varies.

Synonym(s): esophagogastric vestibule