Bat wing opacities (lungs)

Bat's wing or butterfly pulmonary opacities refer to a pattern of bilateral perihilar shadowing. It is classically described on a frontal chest radiograph but can also refer to appearances on chest CT 3-4.

Differential diagnosis

Bat's wing pulmonary opacities can be caused by:

Inspired signs
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Article information

rID: 972
System: Chest, Oncology
Section: Signs, Gamuts
Synonyms or Alternate Spellings:
  • Bat wing opacity
  • Bat wing pulmonary opacities
  • Bat's wing opacity
  • Bat's wing pulmonary opacity
  • Batwing pulmonary opacities
  • Butterfly opacities (lungs)

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Cases and figures

  • Figure 1: fruit bat
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  • Case 1: pulmonary edema
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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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