Target Volume Determination 2015

CTVB: external iliac nodal region Cranial:

• Bifurcation of the common iliac vessels into external/internal iliacs (bony landmark: sacral promontory) Anterior-medial: 0.7-0.8 cm around the vessels >1 cm antero-laterally in case of small vessels or nodes are identified in this area Lateral: Muscles and pelvic bones Posterior: CTVA Caudal: caudad edge of internal obturator vessels (bony landmark: upper edge of the superior rami pubic) Obturator artery

Myerson RJ, Garofalo MC, El Naqa I, et al. Int J Radiat Oncol Biol Phys. 2009