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Taylor A, Rockal AG, Reznek RH et al. Mapping pelvic lymph nodes: guidelines for delineation in intensity-
modulated radiotherapy. Int. J. Radiation Oncology Biol. Phys., Vol 63.no.5, 1604-1612, 2005.
Join external & internal iliac contours,
keep 18 mm from sidewall
Presacral nodes: keep 10 mm
in front of sacrum
Nodal CTV
(
CTV-E
)
Taylor A et al., IJROBP 2005
7 mm margin with minor adjustments: 99 % coverage of lymph nodes