Fig. 2
From: Acute fibrinous and organizing pneumonia: two case reports and literature review
Histologic findings of case 1 on lung biopsy. Hematoxylin and eosin stain (A, ×100) (B, ×200) showed alveoli were filled with fibrinous exudate (arrows) without pulmonary hyaline membrane, the alveolar septum was thickened and infiltrated with a few lymphocytes, which were consistent with AFOP. Masson’s trichrome stain (C, ×100) (D, ×200) showed alveoli cavities were filled with fibrinous exudates (arrows)