Correct!
4. Peripheral opacities

The CT scan shows opacities predominately at the periphery of the lung with relative sparing centrally. This is sometimes called a reverse bat's wing pattern of pulmonary consolidation (1).

Which of the following disorders typically have peripheral pulmonary opacities? (click on the correct answer to proceed to the next panel)

1. Bronchoalveolar carcinoma
2. Chronic eosinophilic pneumonia
3. Cryptogenic organizing pneumonia, formerly bronchiolitis obliterans with organizing pneumonia (BOOP)
4. Pulmonary vasculitis
5. All of the above

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