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