T Category  Criteria 

TX 
Primary tumour cannot be assessed 
Tis 
Carcinoma in situ. 
T1 
2 cm or smaller in greatest dimension AND involving 1 subsite of the hypopharynx only. 
T2 

T3 

T4  Moderately advanced (T4a) or very advanced (T4b) disease 
T4a 

T4b 

N Category  Criteria 

NX 
Regional lymph nodes cannot be assessed. 
N0 
No regional lymph node metastasis. 
N1 

N2  
N2a 

N2b 

N2c 

N3  
N3a 
Metastasis in any lymph node > 6 cm without extranodal extension 
N3b 
Metastasis in any lymph node with clinically overt extranodal extension. 
N Category  Criteria 

NX 
Regional lymph nodes cannot be assessed. 
N0 
No regional lymph node metastasis. 
N1 

N2  
N2a 



N2b 

N2c 

N3  
N3a 
Metastasis in any lymph node > 6 cm without extranodal extension 
N3b 


M Category  Criteria 

M0  No distant metastasis 
M1  Distant metastasis present 
N0 M0 
N1 M0 
N2 M0 
N3 M0 
Any N M1 

T1  I  III  IVA  IVB  IVC 
T2  II  III  IVA  IVB  IVC 
T3  III  III  IVA  IVB  IVC 
T4a  IVA  IVA  IVA  IVB  IVC 
T4b  IVB  IVB  IVB  IVB  IVC 