Version May 2024
| Primary tumor (T) | |||||||
| T category | T criteria | ||||||
| TX | Primary tumor cannot be assessed | ||||||
| T0 | No evidence of primary tumor | ||||||
| T1 | Tumor size category 1 | ||||||
| T1a | Tumor size category 1 without ciliary body involvement and extraocular extension | ||||||
| T1b | Tumor size category 1 with ciliary body involvement | ||||||
| T1c | Tumor size category 1 without ciliary body involvement but with extraocular extension ≤5 mm in largest diameter | ||||||
| T1d | Tumor size category 1 with ciliary body involvement and extraocular extension ≤5 mm in largest diameter | ||||||
| T2 | Tumor size category 2 | ||||||
| T2a | Tumor size category 2 without ciliary body involvement and extraocular extension | ||||||
| T2b | Tumor size category 2 with ciliary body involvement | ||||||
| T2c | Tumor size category 2 without ciliary body involvement but with extraocular extension ≤5 mm in largest diameter | ||||||
| T2d | Tumor size category 2 with ciliary body involvement and extraocular extension ≤5 mm in largest diameter | ||||||
| T3 | Tumor size category 3 | ||||||
| T3a | Tumor size category 3 without ciliary body involvement and extraocular extension | ||||||
| T3b | Tumor size category 3 with ciliary body involvement | ||||||
| T3c | Tumor size category 3 without ciliary body involvement but with extraocular extension ≤5 mm in largest diameter | ||||||
| T3d | Tumor size category 3 with ciliary body involvement and extraocular extension ≤5 mm in largest diameter | ||||||
| T4 | Tumor size category 4 | ||||||
| T4a | Tumor size category 4 without ciliary body involvement and extraocular extension | ||||||
| T4b | Tumor size category 4 with ciliary body involvement | ||||||
| T4c | Tumor size category 4 without ciliary body involvement but with extraocular extension ≤5 mm in largest diameter | ||||||
| T4d | Tumor size category 4 with ciliary body involvement and extraocular extension ≤5 mm in largest diameter | ||||||
| T4e | Any tumor size category with extraocular extension >5 mm in largest diameter | ||||||
NOTES:
| |||||||
| Classification for ciliary body and choroid uveal melanoma based on thickness and diameter | |||||||
| Largest basal diameter (mm) | |||||||
| Thickness (mm) | ≤3.0 | 3.1 to 6.0 | 6.1 to 9.0 | 9.1 to 12.0 | 12.1 to 15.0 | 15.1 to 18.0 | >18.0 |
| >15.0 | 4 | 4 | 4 | ||||
| 12.1 to 15.0 | 3 | 3 | 4 | 4 | |||
| 9.1 to 12.0 | 3 | 3 | 3 | 3 | 3 | 4 | |
| 6.1 to 9.0 | 2 | 2 | 2 | 2 | 3 | 3 | 4 |
| 3.1 to 6.0 | 1 | 1 | 1 | 2 | 2 | 3 | 4 |
| ≤3.0 | 1 | 1 | 1 | 1 | 2 | 2 | 4 |
| Regional lymph nodes (N) | |||||||
| N category | N criteria | ||||||
| NX | Regional lymph nodes cannot be assessed | ||||||
| N0 | No regional lymph node involvement | ||||||
| N1 | Regional lymph node metastases or discrete tumor deposits in the orbit | ||||||
| N1a | Metastasis in one or more regional lymph node(s) | ||||||
| N1b | No regional lymph nodes are positive, but there are discrete tumor deposits in the orbit that are not contiguous to the eye (choroidal and ciliary body) | ||||||
| Distant metastasis (M) | |||||||
| M category | M criteria | ||||||
| M0 | No distant metastasis by clinical classification | ||||||
| M1 | Distant metastasis | ||||||
| M1a | Largest diameter of the largest metastasis ≤3.0 cm | ||||||
| M1b | Largest diameter of the largest metastasis 3.1-8.0 cm | ||||||
| M1c | Largest diameter of the largest metastasis ≥8.1 cm | ||||||
| Prognostic stage groups | |||||||
| When T is... | And N is... | And M is... | Then the stage group is... | ||||
| T1a | N0 | M0 | I | ||||
| T1b-d | N0 | M0 | IIA | ||||
| T2a | N0 | M0 | IIA | ||||
| T2b | N0 | M0 | IIB | ||||
| T3a | N0 | M0 | IIB | ||||
| T2c-d | N0 | M0 | IIIA | ||||
| T3b-c | N0 | M0 | IIIA | ||||
| T4a | N0 | M0 | IIIA | ||||
| T3d | N0 | M0 | IIIB | ||||
| T4b-c | N0 | M0 | IIIB | ||||
| T4d-e | N0 | M0 | IIIC | ||||
| Any T | N1 | M0 | IV | ||||
| Any T | Any N | M1a-c | IV | ||||
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