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QUANTEC Segmentation
Rectum
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The rectum should be segmented from above the anal verge to
the turn into the sigmoid colon (this anterior inflection is best
appreciated on saggital CT). including the rectal contents.
Although there can be variation in defining these landmarks, the
superior limit is where the bowel moves anteriorly, close to the
inferior level of the sacroiliac joints, and the inferior limit is
commonly at the bottom of the ischial tuberosities.