How is the human mediastinum compare to the cat mediastinum?

The mediastinum is an undelineated group of structures in the thorax. In a human, this contains the heart, esophagus, trachea, phrenic nerve, cardiac nerve, thoracic duct, thymus and lymph nodes. In a cat, it includes just the heart, aorta, esophagus, trachea and thymus gland.