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1. At (upper) node level II:
•
VII b (retrostyloid).
2. At node level IV-V:
•
IVb & Vc (supraclavicular fossa).
3. At the boundary with another level
:
•
Both node levels.
4. Abutting a muscle :
•
A 1-2 cm 3D-expansion into the
muscle.
Gregoire et al.
Radiother Oncol
2006; 79:15-20.
Gregoire et al.
Radiother Oncol
2014;110:172-81.
Selecting node level to include in the CTV, if N+
GTV-N
CTV-N
CTV-neck