Regional Childhood Retinoblastoma by Toronto Guidelines v2

**Semantic type:** Neoplastic Process

**Definition:** Orbital extension or regional lymph nodes involvement. (Childhood cancer staging for population registries according to the Toronto Childhood Cancer Stage Guidelines - Version 2. Cancer Council Queensland and Cancer Australia: Brisbane, Australia; 2021.)

**Synonyms:** - Regional Pediatric Retinoblastoma by Toronto Guidelines v2