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Low rectal
cancer:
0- 5 cm from
the anal verge
Mid rectal
cancer:
5-10 cm from
the anal verge
High rectal
cancer:
10-15 cm from
the anal verge
The rectosigmoid junction is
arbitrarily defined as 15 cm above
the anal verge.
A tumor more than 15 cm above the
anal verge is regarded and treated
as a sigmoid tumor.
The anal verge cannot be seen
clearly on MRI
- measure from the anorectal angle.