TABLE 90-20
| Table 90-20. AJCC Staging of malignant primary tumors of the ethmoid sinuses. | |
TNM |
Staging of the Primaries of the Ethmoid Sinuses |
| T1 | Tumor confined to the ethmoids with or without bone erosion |
| T2 | Tumor extends into the nasal cavity |
| T3 | Tumor extends to the anterior orbit, and/or maxillary sinus |
| T4 | Tumor with intracranial extension, orbital extension including apex, involving sphenoid, and/or frontal sinus and/or skin of external nose. |