Bat wing opacities (lungs)

Last revised by Dr Daniel J Bell on 05 Oct 2021

Bat wing opacities, also known as butterfly opacities, refer to a pattern of bilateral perihilar lung shadowing. It is classically described on a frontal chest radiograph but can also refer to appearances on chest CT 3,4.

Differential diagnosis

Bat wing pulmonary opacities can be caused by:

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Cases and figures

  • Figure 1: fruit bat
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  • Case 1
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  • Case 2: pulmonary hemorrhage
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  • Case 3: pulmonary edema
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  • Case 4
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  • Case 5
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  • Case 6: APO
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  • Case 7
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