Target Volume Determination 2015

Kachnic LA, Winter K, Myerson RJ, et al. Int J Radiat Oncol Biol Phys. 2013

Incorrect contouring (81%)

GTV: 21%

CTV elective N: Mesorectum

55% 43% 33% 31%

Presacrum

Inguinal fossa

Iliac nodes