1. To list the causes of secondary pulmonary eosinophilic lung diseases.
2. To compare and to contrast the CT findings of the commonest secondary eosinophilic lung diseases, in particular: allergic bronchopulmonary aspergillosis (ABPA), bronchocentric granulomatosis, and eosinophilic granulomatosis with polyangiitis (EGPA).
3. To reflect on the differential radiologic diagnosis for eosinophilic lung diseases.