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Related to Esophageal hiatus: Aortic hiatus, caval foramen, esophageal hiatus hernia
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have studied the various morphological patterns of circumferential muscle fibers forming the esophageal hiatus and classified them into six groups.
The Z-line is situation in the plane of the esophageal hiatus of the diaphragm (according to endoscopists, at the so-called diaphragmatic pinch), or up to 2 cm above this, in the thoracic esophagus (Akiba; Tolentino et al.
It then narrows again before passing through the left hemidiaphragm at the esophageal hiatus.

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