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Diffuse bilateral mosaic attenuation with lower zonal predominant gas trapping on expiratory images. 'Triple density' appearance within the lung bases. Subpleural and peribronchovascular irregular interlobular septal thickening, traction bronchiolectasis and parenchymal distortion, with no gradient or honeycombing. No pulmonary nodules or pleural effusion. Mediastinal and hilar adenopathy.
Findings are most in keeping with fibrotic hypersensitivity pneumonitis. Differentials of atypical infection or rheumatoid pulmonary fibrosis.