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The Reese Ellworth classification |
| 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 |
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| 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 |
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| Group III |
| a) any lesion anterior to the equator |
| b) solitary tumor >10 disc diameters behind the equator |
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| Group IV |
| a) multiple tumors, some >10 disk diameters |
| b) any lesion extending anteriorly to the ora serrata |
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| Group V |
| a) massive tumors involving more than half the retina |
| b) vitreous seeding |
Aerts et al. Orphanet Journal of Rare Diseases 2006 1:31 doi:10.1186/1750-1172-1-31 |