Hypersensitivity pneumonitis

Case contributed by The Radswiki
Diagnosis almost certain


A bird-fancier presents with breathlessness

Patient Data

Age: 45 years
Gender: Male

Note: This case has been tagged as "legacy" as it no longer meets image preparation and/or other case publication guidelines.


Hypersensitivity pneumonitis

Multiple soft centrilobular nodules throughout the lungs. No evidence of fibrosis. No overt mediastinal nodal enlargement on these limited axial slices on lung windows only.

Typical appearance of hypersensitivity pneumonitis, classical for subacute disease.

Case Discussion

Patient who is a bird fancier presents with shortness of breath, with CT evidence of hypersensitivity pneumonitis, most likely subacute. It is thought to represent a chronic inflammatory response to avian antigens (usually inhaled proteins in the dust of bird feathers and droppings).

Imaging appearances tend to resolve when the initiating antigen is removed.

This case was donated to Radiopaedia.org by Radswiki.net

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