Image-Guided Radiotherapy and Chemotherapy in Gynaecological Cancer

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

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

Taylor A, et al. IJROBP, 2005;63:1604–12