Target Volume Determination 2015

Inferior pelvic subsite (sphincter complex and ischiorectal fossae) – IPS has a risk of LR: 4%, – low seated tumors (<6 cm from the AV): 8% – after APR: 11% – Reccomendation for inclusion in CTV • T < 6 cm from AV (central part), when a SSS • T invading anal sphincter and APR

Roels et al IJROBP 2006