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Table 1 The Reese Ellworth classification

From: Retinoblastoma

Group I
   a) solitary tumor, < 4 disc diameters in size, at or behind the equator
   b) multiple tumor, none > 4 disc diameters in size, at or behind the equator
Group II
   a) solitary tumor, 4–10 disc diameters in size, at or behind the equator
   b) multiple tumor, 4–10 disc diameters in size, behind the equator
Group III
   a) any lesion anterior to the equator
   b) solitary tumor >10 disc diameters behind the equator
Group IV
   a) multiple tumors, some >10 disk diameters
   b) any lesion extending anteriorly to the ora serrata
Group V
   a) massive tumors involving more than half the retina
   b) vitreous seeding