CTICasesActive hypersensitivity pneumonitis
Imaging findings
Chest CT shows diffuse, symmetric ground-glass opacities, centrilobular nodules, and air trapping on expiratory imaging, without significant traction bronchiectasis. Bronchoalveolar lavage confirmed lymphocytosis (80% lymphocytes), and biopsy showed non-necrotizing granulomas.
Key takeaways
Active (inflammatory) hypersensitivity pneumonitis typically presents with centrilobular nodules and ground-glass opacities. Showing air trapping on expiratory CT and lymphocytic alveolitis on lavage is highly supportive of the diagnosis.
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