Version June 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 | ||
| Regional lymph nodes (N) | |||
| N category | N criteria | ||
| NX | Regional lymph nodes cannot be assessed | ||
| N0 | No evidence of lymph node involvement | ||
| N1 | Metastasis in a single ipsilateral regional lymph node, ≤3 cm in greatest dimension | ||
| N1a | Metastasis in a single ipsilateral lymph node based on clinical evaluation or imaging findings | ||
| N1b | Metastasis in a single ipsilateral lymph node based on lymph node biopsy | ||
| N2 | Metastasis in a single ipsilateral lymph node, >3 cm in greatest dimension, or in bilateral or contralateral lymph nodes | ||
| N2a | Metastasis documented based on clinical evaluation or imaging findings | ||
| N2b | Metastasis documented based on microscopic findings on lymph node biopsy | ||
| Distant metastasis (M) | |||
| M category | M criteria | ||
| M0 | No distant metastasis | ||
| M1 | Distant metastasis | ||
| Prognostic stage groups | |||
| When T is... | And N is... | And M is... | Then the stage group is... |
| Tis | N0 | M0 | 0 |
| T1 | N0 | M0 | IA |
| T2a | N0 | M0 | IB |
| T2b-c, T3 | N0 | M0 | IIA |
| T4 | N0 | M0 | IIB |
| Any T | N1 | M0 | IIIA |
| Any T | N2 | M0 | IIIB |
| Any T | Any N | M1 | IV |
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