Proposal of a post-prostatectomy clinical target volume based on pre-operative MRI: volumetric and dosimetric comparison to the RTOG guidelines

Table 1 RTOG Consensus CTV Guidelines

Location	Anatomical border
	Below superior edge of pubic symphysis	Above superior edge of pubic symphysis
Anterior	Posterior edge of pubic bone	Posterior 1-2 cm of bladder wall
Posterior	Anterior rectal wall (may need to be concave around lateral aspects)	Mesorectal fascia
Lateral	Levator ani muscles, obturator internus	Sacrorectogenitopubic fascia (if concern about extraprostatic disease at base may extend to obturator internus)
Inferior	8-12 mm below vesicourethral anastomosis (may include more if concern for apical margin. Can extend to slice above penile bulb if vesicourethral anastomosis not well visualized)	N/A
Superior	N/A	Level of cut end of vas deferens or 3-4 cm above top of symphysis (Vas may retract postoperatively; include seminal vesicle remnants if pathologically involved)

ISSN: 1748-717X