**Common sequel to [[Oesophagus - Pathology#Myasthenia Gravis|myasthenia gravis]], [[Oesophagus - Pathology#Congenital Achalasia - Megaoesophagus|megaoesophagus]] or [[Heart and Great Vessels Development - Pathology#Persistent Right Aortic Arch|persistent right aortic arch]]
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**Common sequel to [[Myasthenia Gravis|myasthenia gravis]], [[Megaoesophagus|megaoesophagus]] or [[Heart and Great Vessels Development - Pathology#Persistent Right Aortic Arch|persistent right aortic arch]]