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Bird-beak sign

Dr Yuranga Weerakkody and Dr Frank Gaillard et al.

The bird-beak sign is used to refer to the tapering of the inferior oesophagus in achalasia. The same appearance (although it is difficult to see the similarity) is also referred to as the rat-tail sign.

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References

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1. Patil KK, Telmesani A, Ogunbiyi OA. Childhood achalasia-a case report. West Afr J Med. 1994;12 (3): 172-4. Pubmed citation