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Difference between revisions of "Colorectal cancer staging"
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→Nodal stage
| Line 42: | Line 42: | ||
! Stage | ! Stage | ||
! Criteria | ! Criteria | ||
! Notes | |||
|- | |- | ||
|N0 | |N0 | ||
| no positive nodes | | no positive nodes | ||
| | |||
|- | |- | ||
| N1a | | N1a | ||
| 1 positive node | | 1 positive node | ||
| | |||
|- | |- | ||
| N1b | | N1b | ||
| 2-3 positive nodes | | 2-3 positive nodes | ||
| | |||
|- | |- | ||
| N1c | | N1c | ||
| [[tumour deposit|tumour deposit(s)]] present with all lymph nodes negative | | [[tumour deposit|tumour deposit(s)]] present with all lymph nodes negative | ||
| lesion must be in the drainage bed of the tumour; lesions ''not'' in the drainage bed are pM1b | |||
|- | |- | ||
| N2a | | N2a | ||
| 4-6 positive nodes | | 4-6 positive nodes | ||
| | |||
|- | |- | ||
| N2b | | N2b | ||
| 7+ positive nodes | | 7+ positive nodes | ||
| | |||
|} | |} | ||
Notes: | Notes: | ||
*Memory device for N2 = 4+ positive LNs: the number ''four'' in chinese sounds like ''death''.<ref>URL: [http://en.wikipedia.org/wiki/Numbers_in_Chinese_culture#Four http://en.wikipedia.org/wiki/Numbers_in_Chinese_culture#Four]. Accessed on: 28 June 2011.</ref> | *Memory device for N2 = 4+ positive LNs: the number ''four'' in chinese sounds like ''death''.<ref>URL: [http://en.wikipedia.org/wiki/Numbers_in_Chinese_culture#Four http://en.wikipedia.org/wiki/Numbers_in_Chinese_culture#Four]. Accessed on: 28 June 2011.</ref> | ||
*Tumour deposits are counted separately. | |||
**Tumour deposits are ''not'' considered lymph nodes. | |||
===Metastasis stage=== | ===Metastasis stage=== | ||