844 / 1481
Coverage of SV
WBH path series: 51/344 (15%). Clinical Risk stratification
1 risk factor ≈ 15% risk SV + and 3 risk factors ≈ 60% risk SV +
Kestin et al IJROBP 2002
SV +ve beyond 1 cm ≈ 7% of cases
SV +ve beyond 2 cm ≈ 1% of cases
Median distances
Of SV ≈ 3.5 cm
Of SV invasion ≈ 1 cm
My recommendation:
Include proximal 2/3 length or 2-2.5 cm for intermediate-high risk CTV