sigmoid colon n the contracted and crooked part of the colon immediately above the rectum called also pelvic colon, sigmoid flexure
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the S-shaped terminal part of the descending colon, which leads to the rectum.
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colon sigmoideum [TA] the S-shaped part of the colon that lies in the pelvis, extending from the pelvic brim to the third segment of the sacrum; it is continuous above with the descending colon and below with the rectum. Called also pelvic c. and sigmoid flexure.Medical dictionary. 2011.