Part 3 · Chest Imaging
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| Pattern | Typical organisms | Note |
|---|---|---|
| Lobar (non‑segmental, crosses segments, fissure‑bounded) | S. pneumoniae (commonest), Klebsiella, Legionella | air bronchograms |
| Bronchopneumonia (patchy, multifocal, peribronchial) | S. aureus, Gram‑negatives, H. influenzae, anaerobes | can cavitate |
| Interstitial / atypical | viruses, Mycoplasma, Chlamydophila | reticular, ground glass |
| Round pneumonia | S. pneumoniae in children | mimics mass; follow up |
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