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International Classification of Retinoblastoma. Group A Small tumor (≤ 3 mm) confined to the retina, distant from the foveola and optic nerve. Group B Tumor > 3 mm, confined to the retina. Group B Small tumors (≤ 3mm), confined to the retina,
E N D
Group A Small tumor (≤ 3 mm) confined to the retina, distant from the foveola and optic nerve.
Group B Tumor > 3 mm, confined to the retina
Group B Small tumors (≤ 3mm), confined to the retina, but in close proximity to optic nerve and foveola.
Group C Tumor with localized subretinal fluid and local seeding
Group D Tumor with diffuse seeding
Group D Tumor with diffuse subretinal fluid and subretinal seeding
Group E Tumor in anterior segment