The Impact of ¹⁸F-FDG PET CT Prior to Chemoradiotherapy for Stage III/IV Head and Neck Squamous Cell Carcinoma

Table 5

Impact of PET-CT upon radiotherapy planning in patients with altered identification of involved lymph node levels (𝑛=20).

	No of patients
PET-CT downclassified lymph node levels:	6
Lymph node not treated that is unilateral  radiotherapy	1
Lymph node in prophylactic dose region	2
In high-dose region	2
Parallel opposed pair hence lymph node in  high-dose region	1
Overall: likely plan change	3
PET-CT identified additional FDG-avid lymph node levels:	14
Lymph node in high-dose region	11
Lymph nodal level in prophylactic dose  region	2
Parallel opposed pair hence lymph	1
node in high-dose region
Overall: likely plan change	7