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.
Bat's wing pulmonary opacities can be caused by:
- pulmonary oedema (especially cardiogenic)
- inhalation injury
- noxious gas
- pulmonary alveolar proteinosis 3
- pulmonary haemorrhage (e.g. Goodpasture syndrome)
- lymphoma / leukaemia
- bronchoalveolar carcinoma
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- 2. Webb WR and Higgins CB. Chapter 2. Consolidation and atelectasis. in Thoracic Imaging: Pulmonary and Cardiovascular Radiology. 2004; Lippincott Williams & Wilkins.
- 3. Swensen SJ, Aughenbaugh GL, Douglas WW et-al. High-resolution CT of the lungs: findings in various pulmonary diseases. AJR Am J Roentgenol. 1992;158 (5): 971-9. AJR Am J Roentgenol (abstract) - Pubmed citation
- 4. Gluecker T, Capasso P, Schnyder P et-al. Clinical and radiologic features of pulmonary edema. Radiographics. 19 (6): 1507-31. Radiographics (full text) - Pubmed citation