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Radiation Oncology • Gastrointestinal Cancers
What GTV to CTV margin do you typically use for the primary lesion in anal cancer?
RTOG 0529 guidelines were 2.5cm margin from GTVA to CTVA (except bone or air), do you still follow this practice?
Answer from: Radiation Oncologist at Academic Institution
I have concerns about even attempting to delineate a GTV for the cephalad portions of many anal canal cancers. An advanced tumor that extends cephalad above the pelvic floor can infest the mesorectal compartment with highly irregular margins. For axial slices at the upper extent of macros...
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