321 / 815
Nodal Margins
GTV-N
Includes all gross disease as per imaging
CTV-N
GTV + 5 – 10mm margin. Uninvolved
nodal areas are contoured according to the
printed atlas (Taylor guidelines). Internal
iliac, external iliac and obturator nodes are
included in all cases.
The common iliac nodes are included in
node positive cases.
PTV-N
=
CTV + 7mm margin.
Taylor A (2005) Mapping pelvic lymph nodes: guidelines for delineation in intensity-
modulated radiotherapy.
Int.J.Radiat.Oncol Biol.Phys. 63(5): 1604-1612.