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The number of margins involved by definition of retroperitoneal margin involvement
| Number of involved RP margins | Based on definition by CAP (0 mm rule) | Based on 1 mm rule |
|---|---|---|
| 1 | 10 | 7 |
| 2 | 3 | 9 |
| 3 | 1 | 4 |
| Total (R1) | 14 | 20 |
CAP, College of American Pathologists.
