Optic Disc Drusen

A 14-year-old girl presents with elevated optic discs noted on screening. She denies headaches with nausea, has normal visual acuity, no RAPD, and full confrontation fields. On dilated examination, the discs appear small and crowded with scalloped margins. At the temporal margin of the right disc, several yellowish refractile bodies are visible just beneath the surface (marked **A** in the diagram). The retinal vessels are NOT obscured as they cross the disc margin, and there is no disc hyperaemia or peripapillary haemorrhage. B-scan ultrasonography shows highly reflective calcified bodies within the nerve head. Which of the following is the most likely diagnosis?