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CTV margins
•
CTV margin for CTV-N is for
extracapsular spread
–
EMBRACE-II recommends 0-3 mm
•
CTV margin for CTV-E is for
variation in location
of nodes
Taylor A, et al. IJROBP, 2005;63:1604–12
3D margin around vessels (mm)
3
5
7
10
15
Nodal coverage 56 % 76 %
88 %
94 % 99 %
7 mm margin with
minor adjustments
: 99% coverage of lymph nodes