Target Volume Determination 2015

Lateral in the lower pelvis = The medial edge of the obturator internus muscle (or bone where the obturator internus is not present) INTERNAL ILIAC LYMPH NODES

Lateral in the upper pelvis = the iliopsoas muscle in.

M. Ng, et al. (AGITG) Int J Radiation Oncol Biol Phys, 2012