| Classification | Description |
|---|---|
| pN1a | Metastases in 1 regional LN |
| pN1b | Metastases in 2–3 regional LNs |
| pN1c | Tumour deposits in the subserosa, mesentery, or nonperitonealized pericolic or perirectal tissues without regional nodal metastasis |
| pN2a | Metastases in 4–6 regional LNs |
| pN2b | Metastases in 7 or more regional LNs |
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