<prompt> All of the following are contents of Posterior Mediastinum exceptAscending AoaHemiazygous veinThoracic ductOesophagus  <response>: Ascending Aoa is present in middle mediastinum.Contents of posterior mediastinum are1 Oesophagus 2 Aeries: Descending thoracic aoa and its branches.3 Veins: i Azygos vein, ii Hemiazygos vein, and iii Accessory hemiazygos vein.4 Nerves: i Vagus, ii Splanchnic nerves5 Lymph nodes and lymphatics i Posterior mediastinal lymph nodes lying alongside aoa. ii The thoracic ductReference: Vishram Singh Anatomy; 2nd edition; Page no: 253 