Contents of Diaphragmatic Openings Mnemonic

3 holes, each with 3 things going through it

Aortic Hiatus : Aorta,  Thoracic duct, Azygous vein

Esophageal Hiatus : Esophagus, vagal trunks, left gastric vessels

Caval Foramen: Inferior vena cava, right phrenic nerve, lymph nodes

(Category: Anaatomy Mnemonic Thorax Abdomen)