A) Chest CT showing a solid intraparenchymal nodule in the right lung with enlargement of hilar lymph nodes and presence of pleuritis with minimal bilateral pleural effusion. B) Lung biopsy showing alveolar epithelial cells falling off and a large amount of fibrin in the alveolar cavity. Neutrophils and a few lymphocytes are infiltrating the interstitium (H&E stain, original magnification x400). C) Lung biopsy showing broken capillary walls of the alveoli. A large amount of fibrin is seen in the alveolar cavities (PASM & Masson, original magnification ×400).