Bird beak sign (disambiguation)

Last revised by Marko Matic on 22 May 2021

Bird beak sign is used in many contexts to denote a rapid tapering to a point, reminiscent of a bird's beak. Described bird beak signs include: 

The term “beak sign” is also applied when a mass deforms the edge of an adjacent organ into a “beak” shape, suggesting that the mass arises from that organ1. While an adjacent organ with dull edges suggests that the mass compresses the organ but does not arise from it.

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Cases and figures

  • Bird beak (photo)
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  • Figure 1: beak sign (ovary)
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