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Varying definition of rectosigmoid junction
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Anatomy
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Cessation of the mesocolon, cessation of the colonic haustra and
a blending of the lateral and anti-mesenteric taenia to form a flat
anterior muscular band.
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Endoscopy
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Narrow sharply angulated segment.
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Radiology
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Anatomists - S3
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Surgeons - sacral promontory