Microscopic lung findings. A, case 1: intra-alveolar fibroblastic bodies, consistent with organizing pneumonia, (H&E, 10×) B, case 2: loss of alveolar architecture with extensive fibrosis (H&E; 10×) C, case 3: inflammatory infiltrate with neutrophils and lymphocytes, note the hyaline membranes (arrows), suggestive for diffuse alveolar damage. (H&E, 20×) D, case 4: prominent fibrinous exudate in alveoli as seen in AFOP (H&E; 10×) E: thrombus in larger vessel (H&E, 5×) F: cytopathogenic changes in pneumocytes due to viral infection seen in all cases: hyperplasia, multinucleated giant cells (asterisks), intranuclear inclusion bodies (H&E, 40×).