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MRI-guided IMRT: CTV delineation
GTV + margin of at least 10 mm, unless safe barriers (bone, muscle).
Parametria, uterus & (part of) vagina (at least 20 mm below GTV).
Pelvic LN: parametrial, pararectal, internal iliac, external iliac, presacral &
common iliac.
Inguinal LN if stage IIIA. Para-Aortal LN only if involved.
Nodal volumes should follow the relevant vessels with a margin of 7 mm in the
loose connective tissue.
Lim K. et al. Int J Radiat Oncol Biol Phys 2011.