Primary tumor (T)
- TX: Primary tumor cannot be assessed
- T0: No evidence of primary tumor
- T(is): Melanoma confined to the conjunctival epithelium
- Malignant conjunctival melanoma of the bulbar conjunctiva
- T1a: Less than or equal to 1 quadrant
- T1b: More than 1 but less than or equal to 2 quadrants
- T1c: More than 2 but less than or equal to 3 quadrants
- T1d: Greater than 3 quadrants
- Malignant conjunctival melanoma of the nonbulbar conjunctiva (palpebral, forniceal caruncular)
- T2a: No caruncular, less than or equal to 1 quadrant
- T2b: No caruncular, greater than 1 quadrant
- T2c: Any caruncular, with less than or equal to 1 quadrant
- T2d: Any caruncular, with greater than 1 quadrant
- Any malignant conjunctival melanoma with local invasion
- T3a: Globe
- T3b: Eyelid
- T3c: Orbit
- T3d: Sinus
- T4: Tumor invades the central nervous system
- Quadrants are defined by clock hour, starting at the limbus (e.g., 6, 9, 12, 3) extending from the central corneal, to and beyond the eyelid margins
- This will bisect the caruncle
