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7. Male pelvis MRI #2, midsagittal plane
The peritoneum drape over the pelvic viscera, forming a number of intraperitoneal recesses and extra-peritoneal compartments. It is not distinctly visualized on this image, yet it is useful to trace its course since the recesses and compartments it creates govern the spread of disease.
It drapes over the dome of the urinary bladder, and extends over the tips of the seminal vesicles. Posteriorly it reflects onto the anterior rectum to form the rectovesicular pouch. In this patient the rectum begins at the level of the S2-S3 sacral junction. Its proximal two-thirds is covered by peritoneum ventrally and laterally. The anus, prostate, and seminal vescicles are extraperitoneal.