663 / 1481
GTV + corresponding mesorectum
Myerson et al IJROBP 2009
GTV-CTV margin
Wang et al. Int J Colorectal dis 2005
Microscopic
tumor deposits in the Mesorectum:
38%
Outer
Region of the Mesorectum:
25%
Distal tumor deposits
in the mesorectal fat
3 cm
from the cancer:
6.5%
Prevent target missing related to movement (ITV)