Pulmonary pseudomonas aeruginosa infection is an uncommon cause of community-acquired pneumonia but can be a common cause of nosocomial pneumonia. It becomes increasingly important in critically ill and ventilated patients.
Pneumonia due to Pseudomonas aeruginosa can occur as several distinct syndromes 3:
- community acquired pneumonia - usually in patients with chronic lung disease
- hospital-acquired pneumonia - usually in the ICU setting, including ventilator associated pneumonia
- bacteremic pseudomonas aeruginosa pneumonia - usually in the neutropenic host
Radiographic features
CT
It can have a number of radiographic presentations with the commonest patterns being 1,4:
- areas of ground-glass attenuation - tend to involve multiple lobes and may demonstrate an upper zonal predilection 4
- bronchial wall thickening
- peribronchial infiltration and areas of consolidation
A pleural effusion may be present in approximately 40% of patients.
Other less common features include intralobular reticular opacities, pleural enhancement, pulmonary cavities, and centrilobular nodules.
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