“…12,16,17 Following enucleation, the incidence of high-risk histopathologic features has varied from 7% to 9% for anterior segment invasion, 8,17 12% to 42% for choroidal invasion, 5,7-9,17 8% to 12% for scleral invasion, 5,8,9,17 2% to 20% for extrascleral invasion, 5,8,9,17 6% to 28% for invasion of postlaminar optic nerve, 5,6,8,9,17,18 1% to 38% for involvement of optic nerve to surgical transection. 5,6,7,8,9,17,18 In a recent comprehensive report on histopathologic findings following enucleation in 297 According to Chantada and associates, 12 there are world disparities in risk definition and management of RB. On the basis of our previous experience, we believe that anterior segment invasion, massive posterior uveal invasion of 3 mm or greater, postlaminar optic nerve invasion, or a combination of any degree of posterior uveal and optic nerve invasion pose a risk; therefore, we include these 4 factors in our definition as high-risk.…”