A 30-year-old obese female (BMI 38) on oral contraceptive pills and doxycycline presents with a 4-month history of progressive daily headache, transient visual obscurations lasting seconds, pulsatile tinnitus, and recent diplopia due to right sixth nerve palsy. MRI brain shows an empty sella, posterior scleral flattening, and distended optic nerve sheaths with no mass or hydrocephalus. Lumbar puncture opening pressure is 42 cm H₂O with normal CSF composition. Fundus examination reveals the findings marked **A** in the diagram — bilateral swollen optic disc with blurred elevated margins, obscuration of vessels crossing the disc margin, disc hyperemia, and loss of spontaneous venous pulsations. Which of the following is the MOST LIKELY underlying condition?
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