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M. Ng, et al. (AGITG) Int J Radiation Oncol Biol Phys, 2012

C

LINICAL

TARGET

VOLUME

FOR

GROSS

DISEASE

P

RIMARY

TUMOR

M. Ng, et al. (AGITG) Int J Radiation Oncol Biol Phys, 2012

CTV =

GTV

+ entire

anal canal + internal

and external sphinter

+ 20 mm ispotropic

margin