Table 2

TNM staging42

T1Tumour limited to one subsite and 20 mm or less in greatest dimension
T2Tumour involves more than one subsite or measures 21–40 mm in size
T3Tumour >40 mm in size or with fixation of hemilarynx
T4Tumour invades adjacent structures
pNXNodes cannot be assessed
pN0No nodal metastasis
pN1Metastasis in single ipsilateral node 30 mm or less in diameter
pN2Metastasis in single ipsilateral node 31–60 mm diameter, or metastasis in multiple ipsilateral, bilateral, or contralateral nodes <61 mm diameter
pN3Metastasis in lymph node more than 60 mm diameter