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Generally applied margins for esophageal cancer
ICRU 50 Definitions: GTV plus areas at risk of microscopic extension
CTV: Gross tumor (GTV)
CTV
+ 3 to 5 cm margin craniocaudal
+ extension to involved nodes
+1 to 2 cm circumferential margin
CTV to PTV: 1 cm
i.e.: field border 5 cm craniocaudal from GTV