Gynae BT 2017

From GTV to CTV

What should be the margin around the nodal GTV?

MDAH Study, 96 nodes with ECE, head and neck cancer

• Median ECE: 1.6 mm • Range: 0.4 – 9 mm • 96 % nodes: < 5mm

No corellation: nodal size - ECE distance

Apisarnthanarax S, et al. IJROBP 2005