Part 3 · Chest Imaging
Same concept, other depth: Foundation →
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| Volume (approx.) | Erect PA appearance |
|---|---|
| ~75 mL | blunted posterior CP angle on lateral |
| ~200–300 mL | blunted lateral CP angle on PA (earliest PA sign) |
| ~500 mL | obscures hemidiaphragm; meniscus sign (higher laterally) |
| ~1 L | reaches about the level of the 4th anterior rib |
| massive | opaque hemithorax, contralateral shift |
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