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A previously healthy 12-year-old girl presented with a 3-week history of intermittent frontal headaches. She did not experience any other symptoms of raised intracranial pressure and had no visual complaints. Local ophthalmology assessment revealed bilateral asymmetric optic disc swelling (right eye more than left eye) with right relative afferent pupillary defect. Her visual acuity and colour vision were normal.
Lumbar puncture showed an opening cerebrospinal fluid (CSF) pressure of 23 cm H2O with no cells in CSF. MRI …