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N Stage
(apart from nasopharynx)
Nx
nodes not evaluable
N0
nodes not clinically involved
N1
single ipsilateral node
≤
3cm
N2a
single ipsilateral node
≤
6cm
N2b
multiple ipsilateral nodes
≤
6cm
N2c
bilateral or contralateral node(s)
≤
6cm
N3
any node >6cm
Nasopharynx
N1
single LN < 6cm above SCF
N2
bilateral nodes
N3
>6 cm or SCF