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MCQ 3: Subarachnoid Hemorrhage Diagnosis%u2022 Question: A 45-year-old man presents with sudden onset of severe headache, described as \ worst headache of my life,\by neck stiffness and photophobia. What is the most appropriate first-line investigation?%u2022 MRI brain%u2022 Lumbar puncture%u2022 Non-contrast CT head%u2022 Cerebral angiography%u2022 EEG%u2022 Answer: Non-contrast CT head%u2022 Explanation: This clinical presentation is highly suggestive of subarachnoid hemorrhage (SAH). The first-line investigation for suspected SAH is a non-contrast CT head. It's quick, widely available, and can detect subarachnoid blood in most cases if performed within 6 hours of symptom onset. If the CT is negative but clinical suspicion remains high, a lumbar puncture would be the next step.