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Gilly staging system
| Stage | Peritoneal carcinomatosis description |
| Stage 0 | No macroscopic disease |
| Stage 1 | PC less than 5 mm in diameter |
| localized in one part of abdomen | |
| Stage 2 | PC less than 5 mm |
| Diffuse in the whole abdomen | |
| Stage 3 | PC 5 mm to 2 cm in diameter |
| Stage 4 | Large PC more than 2 cm |
