CTICasesHypersensitivity Pneumonitis (HP) in a Dog Groomer
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Imaging findings
Initial radiograph showed too-dense lungs, ill-defined vessels, and questioned underlying ground glass opacity. Follow-up CT a week and a half later revealed diffuse ground glass opacity, very central lobular, with some lobules appearing very black, indicating mosaic attenuation and presumably air trapping. A small cyst was also noted.
Key takeaways
Hypersensitivity pneumonitis (HP) is characterized by diffuse ground glass opacity, often central lobular, with mosaic attenuation and air trapping. Radiographs can show subtle increased lung density and ill-defined vasculature. Identifying the antigen is crucial for prognosis, as continued exposure worsens outcomes. Mammalian antigens are rare causes; avian or amphibian exposures are more common, or even water sources with MAC.
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