Histopathology of the lung. A. Numerous hyphae and fungal spores shown by H&E staining. Microscopic cavitation surrounded by numerous hypahes and fungal spores (40x). B. Well-defined Aspergillus head, allowing the visualization of phialides and conidia, with numerous fungal spores (PAS, 400x). C. Well-defined aspergillary structure showing conidiophore, aspergillary vesicle, phialides, and conidia, as well as several hyphae of regular diameter, some with septations and dichotomous branches (Gomori-Grocott, 400x). D. Bronchopneumonia with alveoli filled by neutrophils (H&E, 400x). E. Fibrin thrombi occluding a medium-sized artery (H&E, 400x) F. Squamous metaplasia in alveolar epithelial cells (H&E, 400x).