Case presentation A 76-year-old man presents with a 2-day history of headaches and blurred vision. He complains of general lethargy and muscle aching over the last 3–4 days. On further questioning, he reports that when brushing his hair, he experiences pain on the same side of his forehead as the headache.
Laboratory results Parameter Reported Value Normal Range Haemoglobin 13.2 g/dL 11.5–16.0 g/dL Mean cell volume 86 fL 76–96 fL White cell count 9 x 10 9 /L 4.0–11.0 x 10 9 /L Platelets 355 x 10 9 /L 150–400 x 10 9 /L Erythrocyte sedimentation rate (ESR) 100 mm/h 10–20 mm/h Sodium 132 mmol/L 135–145 mmol/L Potassium 3.9 mmol/L 3.5–5.0 mmol/L Urea 5.1 mmol/L 2.5–6.7 mmmol/L Creatinine 69 μmol/L 44–80 μmol/L Glucose 6 mmol/L 3.5–5.5 mmol/L What is the most probable diagnosis for this patient? (The answer is posted in the comment section below!) *This Case Challenge is from the…
