Figure 4a. Patient 10. Rhizopus species infection in a 53-year-old woman with cough, fever, and chest pain at presentation 2 months after right single-lung transplantation for emphysema. (a) Posteroanterior chest radiograph shows cavitary mass in the native left lower lobe (arrows). Opacities in the right lung (allograft) were unchanged from those seen on multiple prior radiographs. (b) Transverse chest CT scan (10-mm collimation, lung window) confirms a cavitary mass and an intracavitary mass (M) in the left lower lobe and shows the air crescent sign (arrow). CT-guided aspiration biopsy demonstrated Rhizopus species infection that was confirmed at resection of the left lower lobe.