Correct!
5. All of the above

All are causes of reverse bat's wing opacities. Other additional causes include bronchoalveolar carcinoma, pulmonary contusion (in the setting of trauma), pulmonary infarction, and aspiration (1).

A TB-QuantiFERON, urine antigen for legionella, sputum culture, cocci serology, and anti-nuclear antibody (ANCA) were all obtained and were negative

A bronchoscopy with bronchoalveolar lavage (BAL) was performed. The BAL differential was:

• Eosinophils                                 52%
• Lymphocytes                                5%
• Alveolar macrophages              28%
• Neutrophils                                 15%

Which of the following disorders is/are most likely based on the BAL eosinophil percentage? (click on the correct answer to proceed to the next panel)

1. Chronic eosinophilic pneumonia
2. Drug-induced pneumonitis
3. Churg-Strauss syndrome
4. 1 and 3
5. All of the above

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