Part 3 · Chest Imaging
Same concept, other depth: Foundation →
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| Feature | Airspace (alveolar) | Interstitial |
|---|---|---|
| Distribution | lobar/segmental, or perihilar "bat‑wing" | diffuse, often basal or upper‑zone predominant |
| Margins | ill‑defined, fluffy, confluent | discrete: lines, dots, rings |
| Air bronchograms | present | usually absent |
| Acinar nodules | 5–10 mm fluffy (early) | — |
| Evolution | rapid (hours to days) | slow (weeks to years), except oedema |
| HRCT | consolidation / ground glass | reticulation, nodules, interlobular septal thickening, honeycombing |
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