Group | Description | Specific features |
A | Very low risk: Eyes with small discrete tumors away from critical structures | Tumor ≤3 mm in basal dimension or thickness |
B | Low risk: Eyes with discrete retinal tumor of any size or location without vitreous or subretinal seeding | Tumor >3 mm in basal dimension or thickness, or any of the following:
|
C | Moderate risk: Eyes with discrete retinal tumors of any size and location with only focal vitreous or subretinal seeding | One of the following:
|
D | High risk: Eyes with massive nondiscrete tumors and/or diffuse vitreous or subretinal seeding | One of the following:
|
E | Very high risk: Eyes that have been destroyed anatomically or functionally by the tumor | Extensive retinoblastoma or one of the following:
|