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Hypersensitivity Pneumonitis in Adults

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18 Diagnosis Table 6. Histopathological Criteria for the Diagnosis of HP (Other than "Hot-Tub Lung" a ) Matter Typical Sources HP "Disease" Fibrotic HP c Typical histopathological features of fibrotic HP— 1, 2, and 3 in at least one biopsy site: 1. Chronic fibrosing interstitial pneumonia • Architectural distortion, fibroblast foci ± subpleural honeycombing • Fibrotic NSIP-like d pattern Both of the following features (1 and 2 from first column) in at least one biopsy site: 1. Chronic fibrosing interstitial pneumonia • Architectural distortion, fibroblast foci ± subpleural honeycombing • Fibrotic NSIP-like pattern The following features in at least one biopsy site: 1. Chronic fibrosing interstitial pneumonia • Architectural distortion, fibroblast • Fibrotic NSIP- like pattern foci ± honeycombing • Fibrotic NSIP-like pattern 2. Airway-centered fibrosis • ±Peribronchiolar metaplasia • ±Bridging fibrosis e 2. Airway-centered fibrosis • ±Peribronchiolar metaplasia • ±Bridging fibrosis e 3. Poorly formed nonnecrotizing granulomas b ±Cellular interstitial pneumonia ±Cellular interstitial pneumonia ±Cellular interstitial pneumonia ±Cellular bronchiolitis ±Cellular bronchiolitis ±Cellular bronchiolitis ±Organizing pneumonia pattern and ±Organizing pneumonia pattern and ±Organizing pneumonia pattern and Absence of features in any biopsy site to suggest an alternative diagnosis: • Plasma cells > lymphs • Extensive lymphoid hyperplasia • Extensive well-formed sarcoidal granulomas and/ or necrotizing granulomas • Aspirated particulate Absence of features in any biopsy site to suggest an alternative diagnosis: • Plasma cells > lymphs • Extensive lymphoid hyperplasia • Extensive well-formed sarcoidal granulomas and/or necrotizing granulomas • Aspirated particulates Absence of features in any biopsy site to suggest an alternative diagnosis: • Plasma cells > lymphs • Extensive lymphoid hyperplasia • Extensive well-formed sarcoidal granulomas and/or necrotizing granulomas • Aspirated particulates (cont'd)

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