Version May 2024
| Primary tumor (T) | |
| Clinical tumor (cT) | |
| cT category | cT criteria |
| TX | Primary tumor cannot be assessed |
| T0 | No evidence of primary tumor |
| T1 | Tumor of the bulbar conjunctiva |
| T1a | <1 quadrant |
| T1b | ≥1 to <2 quadrants |
| T1c | ≥2 to <3 quadrants |
| T1d | ≥3 quadrants |
| T2 | Tumor of the nonbulbar (forniceal, palpebral, tarsal) conjunctiva, and tumor involving the caruncle |
| T2a | Noncaruncular, and ≤1 quadrant of the nonbulbar conjunctiva involved |
| T2b | Noncaruncular, and >1 quadrant of the nonbulbar conjunctiva involved |
| T2c | Caruncular, and ≤1 quadrant of the nonbulbar conjunctiva involved |
| T2d | Caruncular, and >1 quadrant of the nonbulbar conjunctiva involved |
| T3 | Tumor of any size with local invasion |
| T3a | Globe |
| T3b | Eyelid |
| T3c | Orbit |
| T3d | Nasolacrimal duct and/or lacrimal sac and/or paranasal sinuses |
| T4 | Tumor of any size with invasion of the central nervous system |
| Pathological tumor (pT) | |
| pT category | pT criteria |
| TX | Primary tumor cannot be assessed |
| T0 | No evidence of primary tumor |
| Tis | Melanoma confined to the conjunctival epithelium |
| T1 | Tumor of the bulbar conjunctiva |
| T1a | Tumor of the bulbar conjunctiva with invasion of the substantia propria, not more than 2.0 mm in thickness |
| T1b | Tumor of the bulbar conjunctiva with invasion of the substantia propria, more than 2.0 mm in thickness |
| T2 | Tumor of the nonbulbar (forniceal, palpebral, tarsal) conjunctiva, and tumor involving the caruncle |
| T2a | Tumor of the nonbulbar conjunctiva with invasion of the substantia propria, not more than 2.0 mm in thickness |
| T2b | Tumor of the nonbulbar conjunctiva with invasion of the substantia propria, more than 2.0 mm in thickness |
| T3 | Tumor of any size with local invasion |
| T3a | Globe |
| T3b | Eyelid |
| T3c | Orbit |
| T3d | Nasolacrimal duct and/or lacrimal sac and/or paranasal sinuses |
| T4 | Tumor of any size with invasion of the central nervous system |
| Regional lymph nodes (N) | |
| N category | N criteria |
| NX | Regional lymph nodes cannot be assessed |
| N0 | No regional lymph node metastasis |
| N1 | Regional lymph node metastasis |
| Distant metastasis (M) | |
| M category | M criteria |
| M0 | No distant metastasis |
| M1 | Distant metastasis |
| Prognostic stage groups | |
| There is no proposal for anatomic stage and prognostic groups for conjunctival melanoma. | |
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