"stage 0: patients treated conservatively"
"stage I: eye enucleated, completely resected histologically"
"stage II: eye enucleated, microscopic residual tumour"
"stage III: regional extension"
"stage IV: metastatic disease"
"Reese Ellsworth classification"
"International Classification of Retinoblastoma"
"A: overt orbital disease"
"B: preauricular or cervical lymph node extension"
"A: haematogenous metastasis without CNS involvement"
"B: CNS metastatic involvement"
Expected headings
"Staging"
"Reese Ellsworth classification"
"International Classification of Retinoblastoma"