A 72-year-old man is brought to the emergency department after being found unresponsive. His family reports a history of hypertension, hyperlipidemia, and occasional falls. On examination, he is comatose, pupils are unequally reactive, and there is right-sided hemiparesis. A non-contrast CT head scan shows a crescent-shaped hyperdensity overlying the left cerebral hemisphere. What is the most likely diagnosis?
✓ Correct Answer: Option B
The crescent-shaped hyperdensity on CT head is characteristic of a subdural hematoma. Given his age, history of falls, and hemiparesis, it's highly suggestive of chronic subdural hematoma which can present acutely after a minor head injury.