The Role of Intraarterial Chemotherapy in the Management of Retinoblastoma

Table 2

Reese–Ellsworth classification for retinoblastoma [14].

Group	Likelihood of globe salvage	Specific features (DD: disc diameter)
I	Very favourable	Solitary tumour <4 DD in size, at or behind the equator; Multiple tumours, none >4 DD in size, all at or behind the equator
II	Favourable	Solitary tumour 4–10 DD in size, at or behind the equator; Multiple tumours 4–10 DD in size, behind the equator
III	Doubtful	Any lesion anterior to the equator; Solitary tumour >10 DD behind the equator
IV	Unfavourable	Mulitple tumours, some >10 DD; Any lesion extending anteriorly to the ora serrata
V	Very unfavourable	Massive tumour involving over half the retina; Vitreous seeding