Bird beak sign (oesophagus)

Last revised by Mohammad Taghi Niknejad on 6 Dec 2022

The bird's beak sign of the oesophagus is used to refer to the tapering of the inferior oesophagus in achalasia. The same appearance is also referred to as the rat's tail sign.

The appearance, although classically occurring in primary achalasia, can also occur in pseudoachalasia due to a gastric tumour involving the gastro-oesophageal junction.

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