A 5-year-old girl presents with progressive vision problems and frequent headaches. Her parents report that she has been tripping over objects and complains of double vision. Physical examination reveals proptosis of the right eye. An MRI of the brain shows a mass along the right optic nerve. The child also has multiple café-au-lait spots on her trunk and axillary freckling. Question: Which of the following is the most likely diagnosis for the optic mass?
