Reverse bat wing pulmonary opacities
Reverse bat wing pulmonary opacities refer to peripheral opacities of the lungs, sparing the perihilar region. It is a relatively unusual appearance with a relatively narrow differential:
- chronic eosinophilic pneumonia
- organizing pneumonia (formerly bronchiolitis obliterans with organizing pneumonia (BOOP))
- bronchoalveolar carcinoma
- pulmonary contusion: in the setting of trauma
- pulmonary hemorrhage +/- infarction: in the context of pulmonary embolism
- pulmonary vasculitis
- aspiration
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