FWIW, Pi returns: "The caval hiatus is located at the level of the T8 vertebra, which is near the middle of the spine. It's a small opening in the diaphragm tha

FWIW, Pi returns: "The caval hiatus is located at the level of the T8 vertebra, which is near the middle of the spine. It's a small opening in the diaphragm that allows the inferior vena cava, a major vein, to pass through. There's also a nearby opening called the esophageal hiatus, which is where the esophagus passes through the diaphragm. The caval hiatus is an important anatomical landmark, and it's also sometimes called the caval opening or the caval orifice. Is this something you're studying for a class or just out of curiosity?"