lies between the pericardium anteriorly and the vertebral column posteriorly and below the level of the plane that interesects the sternal angle and the T4–5 intervertebral disc. It contains the descending aorta, thoracic duct, esophagus, azygos veins, and vagus nerves.
Synonym(s): mediastinum posteriusTA, postmediastinum
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Examples: glitazone, GI cocktail, etc.