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Difference between revisions of "Colorectal cancer staging"
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→TNM staging system
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==TNM staging system== | ==TNM staging system== | ||
===Tumour stage=== | ===Tumour stage=== | ||
*Tis - in situ (intramucosal). | *Tis - in situ ([[Intramucosal colorectal carcinoma|intramucosal]]).‡ | ||
*T1 - into submucosa (through mucularis mucosae). | *T1 - into submucosa (through mucularis mucosae). | ||
**This is '''different than elsewhere''', e.g. in the ''small bowel'' tumour cells in the ''lamina propria'' is defined as T1. The rationale for the ''T1'' definition in CRC is that no lymphatics are present in the mucosa, ergo no risk of distant spread. | **This is '''different than elsewhere''', e.g. in the ''small bowel'' tumour cells in the ''lamina propria'' is defined as T1. The rationale for the ''T1'' definition in CRC is that no lymphatics are present in the mucosa, ergo no risk of distant spread. | ||
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Note: | Note: | ||
*High-grade dysplasia, "intramucosal colorectal carcinoma", and "[[colorectal adenocarcinoma in situ]]" are used interchangeably by many in the colon and rectum. | *‡ 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]]"'' | **''High-grade dysplasia'' is the preferred term - see ''"[[intramucosal colorectal carcinoma]]"''. | ||
===Nodes stage=== | ===Nodes stage=== | ||