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The CTV of N0 neck: 2003 guidelines
(Appendix 3)
• 6 node levels (Ia, Ib, IIa, IIb, III-VI) and
retropharyngeal nodes.
• CT-based boundaries of each node
level as a part of the CTV.
• For conformal (3DCRT and/or IMRT)
radiotherapy
• Not for diagnosis, surgery or
prediction of nodal involvement.
How do we define the CTV of elective neck? cN0