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AAST diaphragm injury scale
| Grade* | Description of injury |
|---|---|
| I | Contusion |
| II | Laceration < 2 cm |
| III | Laceration 2–10 cm |
| IV | Laceration > 10 cm with tissue loss (< 25 cm2) |
| V | Laceration with tissue loss > 25 cm2 |
*Advance one grade for bilateral injuries up to grade III
