Lung biopsy
Histopathologic findings of lung biopsy revealed diffuse alveolar damage (DAD) in early phase which was characterized by interstitial edema with focally fibrinous exudates and hyaline membranes. Intra-alveolar hemorrhage with mild interstitial inflammation consisted of lymphocytes and histiocytes and focal parenchymal necrosis were identified. Focal alveolar destruction was seen. Also large multinuclated pneumocytes without evidence of intranuclear or cytoplasmic inclusion was noted. There was no evidence of mucus plugging with in airways. No granuloma or eosinophilic infiltration were identified.