Group | Description | Mnemonic | Specific features |
A | Very low risk: Eyes with small discrete tumors away from critical structures | A is for Away (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 | B is for Bigger (Bigger and/or closer than group A) | 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 | C is for Seeding (Early localized seeding) | One of the following:
|
D | High risk: Eyes with massive nondiscrete tumors and/or diffuse vitreous or subretinal seeding | D is for Diffuse seeding | One of the following:
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E | Very high risk: Eyes that have been destroyed anatomically or functionally by the tumor | E is for Extensive | Extensive retinoblastoma or one of the following:
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