Reese and Ellsworth developed a classification system for patients with retinoblastoma.
Findings
Group
solitary, < 4 disc diameters in size, at or behind equator
IA
multiple, < 4 disc diameters in size, at or behind the equator
IB
solitary, 4-10 disc diameters in size, at or behind the equator
IIA
multiple, 4-10 disc diameters in size, at or behind the equator
IIB
solitary or multiple, any size, anterior to equator
IIIA
solitary, > 10 disc diameters in size, at or behind the equator
IIIB
multiple tumors, any > 10 disc diameters in diameter
IVA
solitary or multiple, any size, extending anteriorly to the ora serrata
IVB
massive tumor involving more than half of the retina
VA
vitreous seeding
VB
where:
• The ora serrata is at the transition between neural retina to nonpigmented epithelium near the iris and ciliary body (page 8.1.1, Yanoff M, Duker JS, Ophthalmology. 1999.)
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