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CT CONTOURING
For CT-based treatment planning, the width of the cervix and any parametrial
extension should be contoured as the HR-CTV.
The superior border of the cervix should extend at least 1 cm above the
uterine vessels identified by intravenous contrast or the location where the
uterus begins to enlarge.
If CT anatomy does not permit identification of the cervix, a height of
approximately 3 cm should be contoured for the cervix, with the caveat for CT-
planned cases that the entire length of the tandem should be treated, as precise
determination of the superior extent of disease is not feasible.
OAR should be contoured including the bladder, rectum, and sigmoid.