Fig. 4. Plaque radiotherapy. A. Drawing of a plaque showing the gold shield on the outer surface (left) and the embedded radioactive iodine seeds on the inner surface (right). B. Localization of the intraocular tumor by transillumination (left) and placement of the episcleral sutures for the plaque (right). C. Macular retinoblastoma in a 3-month-old boy before plaque treatment. D. Regressed macular retinoblastoma 2 years after plaque radiotherapy. Notice the healthy optic disc.