CTVP
|
Prostate as defined using CT and MRI imaging + any extra-prostatic extension as noted on examination or pre-ADT imaging |
All patients |
CTVECE
|
3 mm isotropic margin from CTVP, excluding overlap with rectum |
If ECE risk ≥ 15 % |
CTVSVI
|
Entire bilateral seminal vesicles (only contoured if known seminal vesicle involvement) |
If SV involved |
CTVSVA
|
Proximal 20 mm of SV, measured obliquely along long axis of SV (only contoured for adjuvant treatment of seminal vesicles) |
If SVI risk ≥ 15 % |
CTVLN
|
Pelvic nodes: 7 mm margin around obturator, pre-sacral, and external and internal iliac vessels contoured as per RTOG consensus guidelines [21], up to 10 mm inferior to the sacral promontory) |
If LNI risk ≥ 15 % |
PTV70 |
If no SV involvement: 5 mm margin around CTVP If SV involvement: 5 mm margin around CTVP + 7 mm margin around CTVSVI anteriorly and posteriorly and 5 mm otherwise |
All patients |
PTV61.6 |
If SV involvement or SVI risk <15 %: 5 mm margin around CTVECE If no SV involvement and SVI risk ≥15 %: 5 mm margin around CTVECE + 7 mm margin around CTVSVA anteriorly and posteriorly and 5 mm otherwise |
If CTVECE or CTVSVA contoured |
PTV50.4 |
5 mm margin around CTVLN
|
If CTVLN contoured |