1102 / 1481
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 +
sphincter muscles
+
20 mm isotropic margin
while respecting anatomical
boudaries