Group E Retinoblastoma

**Semantic type:** Classification

**Definition:** Extensive retinoblastoma; retinoblastoma occupying more than 50% of globe, or neovascular glaucoma, or massive intraocular hemorrhage, or infiltration of postlaminar optic nerve, choroid, sclera, orbit, and anterior chamber.

**Synonyms:** - Very High Risk Retinoblastoma