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Two patients with hypersensitivity pneumonitis. The first patient shows a mosaic pattern with patchy and centrilobular (circle) ground glass typical of HP, and very mild upper lung fibrosis manifesting as traction bronchiectasis (a). A second patient with more advanced fibrosis shows upper lung traction bronchiectasis, distortion, and ground glass (b) with much milder abnormality in the lower lungs (c). HP, hypersensitivity pneumonitis.
