Version May 2024
| Primary tumor (T) | |
| T category | T criteria |
| TX | Primary tumor cannot be assessed |
| T0 | No evidence of primary tumor |
| Tis | Carcinoma in situ |
| T1 | Tumor ≤10 mm in greatest dimension |
| T1a | Tumor does not invade the tarsal plate or eyelid margin |
| T1b | Tumor invades the tarsal plate or eyelid margin |
| T1c | Tumor involves full thickness of the eyelid |
| T2 | Tumor >10 mm but ≤20 mm in greatest dimension |
| T2a | Tumor does not invade the tarsal plate or eyelid margin |
| T2b | Tumor invades the tarsal plate or eyelid margin |
| T2c | Tumor involves full thickness of the eyelid |
| T3 | Tumor >20 mm but ≤30 mm in greatest dimension |
| T3a | Tumor does not invade the tarsal plate or eyelid margin |
| T3b | Tumor invades the tarsal plate or eyelid margin |
| T3c | Tumor involves full thickness of the eyelid |
| T4 | Any eyelid tumor that invades adjacent ocular, orbital, or facial structures |
| T4a | Tumor invades ocular or intraorbital structures |
| T4b | Tumor invades (or erodes through) the bony walls of the orbit or extends to the paranasal sinuses or invades the lacrimal sac/nasolacrimal duct or brain |
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