526 / 1481
Level I
Level II
Level III
Level IV Level V Others
N0 [%]
98/100* 29/79
52/90 82/93 85/96 98/100
Ipsilateral nodes
Contralateral nodes
100-98=2
100-100=0
100-29=71
100-79=21
100-52=48
100-90=10
100-82=18
100-93=7
100-85=15
100-96=4
100-98=2
100-100=0
Probability of occult
nodal metastases
<5%
>5%
ips/con
>5%
ips/con
>5%
ips/con
>5% ips
<5%
To be included in the
CTV
-
+/+
+/+
+/+
+/-
-
*ipsilateral/contralateral cervical lymph nodes
Gregoire et al.
Radiother Oncol
2000; 56:135-50.
Eisbruch et al.
Semin Radiat Oncol
2002;12:2380-49.
E.g.
, SCC of the supraglottis, N0:
Selecting node level to include in the CTV