Figure 7c. Invasive bronchiolar aspergillosis in a patient who underwent bone marrow transplantation. (a) High-resolution CT scan (lung window) shows peripheral branching structures (arrow) associated with focal areas of consolidation in the right lower lobe. (b) Corresponding photograph of the autopsy specimen shows multiple yellowish acinar nodules (arrows). (c) Photomicrograph (original magnification, x250; periodic acid–Schiff stain) of a lung biopsy specimen shows complete destruction of the bronchiolar wall (arrowheads) by Aspergillus organisms (arrow).