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Acute fibrinous and organizing pneumonia pattern, organizing phase. Fibromyxoid plugs in bronchioles and alveolar spaces, with minimal alveolar septal thickening. (a) H&E, original magnification × 40; (b) elastic trichrome (same field as (a)), original magnification × 40; (c) H&E, original magnification × 100; (d) elastic trichrome (same field as (c)), original magnification × 100.
