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Crow feet sign (round atelectasis)

Last revised by Assoc Prof Craig Hacking on 23 Apr 2020

Crow feet sign is a characteristic, but uncommon, feature seen in round atelectasis.

On CT, this is seen as linear bands radiating from a mass into adjacent lung tissue resembling the feet of a crow. This sign should not be confused with fibrotic changes occurring in the lung.

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Cases and figures

  • Figure 1: birds feet (photo)
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  • Case 1
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  • Case 2
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