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Fig. 2B. —Pelvis and retrorectal space. Sagittal T2-weighted fast
spin-echo image obtained in 68-year-old man with recrtal adenocarcinoma shows
posterior fascial layers of pelvis. Visceral mesorectal fascia (long solid
arrow) is lying anterior to presacral fascia (short solid
arrow). High signal deep relative to presacral fascia
(arrowhead) represents fat, and signal void of median sacral vessel
(open arrow) lies in retrorectal space.
