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Table 1: Modified Dulguerov TNM staging
Staging Description
Primary tumor
    T1 Tumor involving the nasal cavity and/or paranasal sinuses (excluding sphenoid), sparing the most superior ethmoidal cells
    T2 Tumor involving the nasal cavity and/or paranasal sinuses (including the sphenoid) with extension to or erosion of the cribriform plate
    T3 Tumor extending into the orbit or protruding into the anterior cranial fossa
    T4 Tumor involving the brain
Lymph nodes
No regional lymph node metastasis
    N1 Metastasis in a single ipsilateral lymph node, ≤3 cm in greatest dimension
    N2A Metastasis in a single ipsilateral lymph node >3 cm but not >6 cm in greatest dimension
    N2B Metastasis in multiple ipsilateral lymph nodes, none >6 cm in greatest dimension
    N2C Metastasis in bilateral or contralateral lymph nodes, none >6 cm in greatest dimension
    N3 Metastasis in a lymph node >6 cm in greatest dimension
Distant metastasis
    M0 No evidence of distant metastasis
    M1 Evidence of distant metastasis