535 / 1311
cN0 neck in head-and-neck cancer per node level [%]
Gregoire
et al.
Radiother Oncol
2000; 56:135-50.
Tumor site
Level I
Level II Level III Level IV Level V
Others
Oral cavity
58/96.5* 21/92
82/97
95/99
99/0
98.6/99.7
Oropharynx
87/98
19/76
77/95
91/97.5
87/97
98/99
Hypopharynx
98/100
20/87
49/96
80/97
76/98
97/99
Larynx:
Supraglottis
98/100
29/79
52/90
82/93
85/96
98/100
Nasopharynx
91/95
29/44
64/68
78/85
68/74
85/90
*ipsilateral/contralateral cervical lymph nodes
How do we define the CTV of elective neck? cN0