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Difference between revisions of "Colorectal cancer staging"
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==TNM staging system== | ==TNM staging system== | ||
===Tumour stage=== | ===Tumour stage=== | ||
{| class="wikitable sortable" | |||
! Stage | |||
! Criteria | |||
! Notes | |||
|- | |||
| Tis | |||
| in situ ([[Intramucosal colorectal carcinoma|intramucosal]]) ‡ | |||
| high-grade dysplasia, "intramucosal colorectal carcinoma", and "[[colorectal adenocarcinoma in situ]]" are used interchangeably by many in the colon and rectum; ''high-grade dysplasia'' is the preferred term - see ''"[[intramucosal colorectal carcinoma]]"'' | |||
|- | |||
| T1 | |||
| into submucosa (through mucularis mucosae), not into muscularis propria | |||
| '''different than elsewhere in GI tract'''; in the ''small bowel'' tumour cells in the ''lamina propria'' is defined as T1; rationale for the ''T1'' definition in CRC is that no lymphatics are present in the mucosa, ergo no risk of distant spread | |||
|- | |||
| T2 | |||
| into muscularis propria | |||
| | |||
|- | |||
| T3 | |||
| into fat beyond musclaris propria | |||
| | |||
|- | |||
| T4a | |||
| invasion of the visceral peritoneum | |||
| | |||
|- | |||
| T4b | |||
| grows into something else | |||
| | |||
|} | |||
===Nodes stage=== | ===Nodes stage=== | ||