The phrenic ampulla (also known as the oesophageal vestibule) is the region between the A-ring and B-ring of the distal oesophagus.
The gastro-oesophageal junction is below the ampulla (and gastric folds should not enter the region of the ampulla).
The ampulla is more prominent in some patients than in others, but it is a normal finding and should not be confused with a sliding hiatal hernia or an oesophageal web.
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