Table 1:

Modified Dulguerov TNM staging

StagingDescription
Primary tumor
    T1Tumor involving the nasal cavity and/or paranasal sinuses (excluding sphenoid), sparing the most superior ethmoidal cells
    T2Tumor involving the nasal cavity and/or paranasal sinuses (including the sphenoid) with extension to or erosion of the cribriform plate
    T3Tumor extending into the orbit or protruding into the anterior cranial fossa
    T4Tumor involving the brain
Lymph nodes
No regional lymph node metastasis
    N1Metastasis in a single ipsilateral lymph node, ≤3 cm in greatest dimension
    N2AMetastasis in a single ipsilateral lymph node >3 cm but not >6 cm in greatest dimension
    N2BMetastasis in multiple ipsilateral lymph nodes, none >6 cm in greatest dimension
    N2CMetastasis in bilateral or contralateral lymph nodes, none >6 cm in greatest dimension
    N3Metastasis in a lymph node >6 cm in greatest dimension
Distant metastasis
    M0No evidence of distant metastasis
    M1Evidence of distant metastasis