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Femoral head and neck:
The entire femoral
head
and neck
should be
contoured.
The inferior
extent
is the cranial edge
of the lesser trochanter.
Urinary bladder:
The entire
external outline of the
bladder wall should be
contoured.
M. Ng, et al. (AGITG) Int J Radiation Oncol Biol Phys, 2012
Organs at risk (OAR)
Gay HA et al. Int J Radiat Oncol Biol Phys. 2012