Community-Acquired Pneumonia
Overview
Chest X-Ray Signs of Pneumonia
- Pulmonary consolidation without volume loss - may be lobar (lobar pneumonia) or multifocal
- Air bronchograms - tubular outlines of the smaller airways
- Silhouette signs - obliteration of normally clear outlines between lung fields and adjacent structures
Classification
- Community-acquired pneumonia
- Hospital-acquired pneumonia
- Ventilator-associated pneumonia
Causes of Pneumonia
- Bacteria - Streptococcus pneumoniae, Haemophilus influenzae, Moraxella catarrhalis, Staph aureus, Mycoplasma, Legionella, Chlamydia
- Viruses - influenza, parainfluenza, human metapneumovirus, RSV
- Fungi - Pneumocystis, aspergillosis
Examples
- Left lower zone pneumonia
![Left lower zone pneumonia]()
- Right middle lobe pneumonia - PA film
![Right middle lobe pneumonia - PA film]()
- Right middle lobe pneumonia - lateral film
![Right middle lobe pneumonia - lateral film]()
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