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Posterior Border. a. Cranially, CT-based delineation of the CTV up to the anterior wall of the rectum; b. Caudally, CT-based delineation of the CTV up to the anterior wall of the rectum including the existing surgical clips and the antero-lateral angles of the rectum. Arrow shows antero-lateral angles of the rectum. Abbreviation: CT = computed tomography; CTV = clinical target volumes; MRI = magnetic resonance imaging.
