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PRESACRAL
SPACE
M. Ng, et al. (AGITG) Int J Radiation Oncol Biol Phys, 2012
Lateral: The sacro-iliac joints.
Anterior: 10 mm anterior to the
anterior sacral border.
Posterior: The anterior border of
the sacral bone.
Cranial: The sacral promontory.
Caudal: The inferior edge of the coccyx
Taylor A et al. Clin Oncol (R Coll Radiol). 2007