Subacute hypersensitivity pneumonitis
Patient presents with a few months history of progressive dyspnea and cough. Non-smoker.
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- Centrilobular ground glass nodules with an upper and mid zone predominance
- More confluent ground glass opacification in the mid zones
- Area of lobular sparing in the lung bases
This case demonstrates the radiological features of subacute hypersensitivity pneumonitis.
On further questioning the patient had a long history of exposure to pet birds.
The patient was treated with oral steroids over a period of months with symptomatic improvement.
Respiratory bronchiolitis can have a similar appearance, but the ground glass nodules tend be more sparse/patchy in distribution, and is found in smokers.