MRCP2-3188
A 35-year-old man who is 25 weeks pregnant with his first child comes to the Emergency Department. He has been experiencing increasingly severe morning headaches over the past four weeks and, over the past three days, has developed double vision and feels that his vision is fading when he leans forward. Upon examination, his blood pressure is 120/80 mmHg and his pulse is 80 bpm and regular. He is obese with a body mass index of 34 kg/m2. There is bilateral papilloedema, but his eye movements are unaffected.
Investigations;
Investigations Results Normal Values
Haemoglobin (Hb) 120 g/l 115–155 g/l
White cell count (WCC) 6.5×109/l 4–11 × 109/l
Platelets (PLT) 180×109/l 150–400 × 109/l
Sodium (Na+) 138 mmol/l 135–145 mmol/l
Potassium (K+) 4.0 mmol/l 3.5–5.0 mmol/l
Creatinine 92 µmol/l 50–120 µmol/l
Computed tomography (CT) head and CT venogram with abdominal shield, Normal intracranial appearances, no venous sinus thrombosis identified
What is the most appropriate next step?