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The most common findings on radiographs are transient, patchy, nonsegmental opacities without a zonal predilection. Small noncavitary nodules or diffuse reticular opacities may also bee seen.
CT may reveal small (< 10 mm) centrilobular nodules (60% of cases), ground-glass opacities (50%), bronchial wall thickening (50%), bronchial dilatation (50%), consolidation (40%), interlobular septal thickening (40%), mosaic perfusion (50%), and unilateral or bilateral pleural effusion (50%).
Differential considerations include:
- Simple pulmonary eosinophilia: Löffler syndrome.
- Chronic eosinophilic pneumonia:
- Subacute hypersensitivity pneumonitis: May also have small centrilobular nodules or nodular ground-glass opacity.
- Metastatic calcification: May also have small centrilobular nodules or nodular ground-glass opacity.
- Microscopic polyangiitis: May also have small centrilobular nodules or nodular ground-glass opacity.
- Systemic lupus erythematosis: May also have small centrilobular nodules or nodular ground-glass opacity.
- Respiratory bronchiolitis-interstitial lung disease: May also have small centrilobular nodules or nodular ground-glass opacity.
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