Figure 5b. Bacterial infection. (a) Chest radiograph obtained in a patient with bilateral lung transplants for pulmonary fibrosis shows patchy and confluent airspace consolidation with air bronchograms (arrows) within the lingula. Transbronchial biopsy cultures revealed the presence of P aeruginosa. (b) Chest CT image obtained in another patient, who received a right lung transplant for chronic obstructive pulmonary disease (COPD), demonstrates foci of consolidation (arrows) within the right middle and lower lobes of the allograft lung, findings indicative of bacterial pneumonia.