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Figure 8a. Trilateral retinoblastoma in a child of unknown age. (a) Axial CT image enhanced with intravenous contrast material shows bilateral hyperattenuating nodular masses containing dense foci of calcification (arrowheads). (b) Axial CT image enhanced with intravenous contrast material shows a large, round, intensely enhancing mass in the pineal region, which causes hydrocephalus.