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A 60-year-old man presented to our clinic with a 6-month history of progressive visual loss in the left eye. Twelve months prior, he experienced an acute left hemianopia secondary to a stroke. He was anticoagulated and fully recovered. Six months following the stroke, he began to notice blurred vision in his left eye. There was no formal ophthalmic examination performed at that time, but a plastic surgeon believed that a left medial upper eyelid mass lesion was causing distortion of his vision, and proceeded to excision biopsy. Histopathology revealed Rosai-Dorfman disease (RDD). Postoperatively, the patient's visual loss continued to worsen and he was referred to our clinic.

Clinical Reasoning: Compressive optic neuropathy secondary to intracranial Rosai-Dorfman disease