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Fig. 5D. —Acute and subacute hypersensitivity pneumonitis in 36-year-old woman. (Reprinted from [10]) CT scan (1.5-mm collimation) obtained at same time as B and C predominantly shows poorly defined centrilobular nodules (arrows). Note peripheral well-defined nodule in right upper lobe (arrowhead). Thoracoscopic lung biopsy revealed hypersensitivity pneumonitis. Offending antigen was never identified.