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Fig. 10B —53-year-old man with hypersensitivity pneumonitis. Surgical lung
biopsy specimen of right lower lobe shows thickening of alveolar wall by mild
to moderate inflammation consisting mostly of lymphocytes and plasma cells.
Histologic findings are those of nonspecific interstitial pneumonitis.
Diagnosis of hypersensitivity pneumonitis was based on radiologic and clinical
findings. Patient had positive results for Aspergillus precipitins,
but specific etiologic agent for hypersensitivity pneumonitis was not
identified. (H and E, x40)
