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SIOP UMBRELLA – RT
Target Volume Definition
•
GTV: based on the combination of pre-operative
imaging, (clips?) and the reports by the surgeon
and pathologist. Includes the contact zone of the
pre-surgery tumour
•
CTV: Expanded GTV with an anatomically
confined margin of 5-10 mm (without expansion
into the intestines) including the para-aortic
lymph node chain in case of lymph node
involvement