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 |