A 46-year-old man has a headache and confusion three days after slipping in the garden. What is the single most appropriate investigation?

A 46-year-old man has a headache and confusion three days after slipping in the garden. What is the single most appropriate investigation?

a. CT scan of the brain
b. No investigation required
c. Carotid arteriogram
d. Lumber puncture
e. Temporal artery biopsy

Ans. The key is A. CT scan of the brain. [Probable diagnosis is subdural hematoma. Slipping in the garden caused some injury to head which led to subdural hematoma supported by clinical features of headache and confusion after 3 days. So the investigation of choice in such case is CT scan of the brain].