Question

A 55-year-old man suddenly develops a severe headache described as 'thunderclap' in onset. He is photophobic and has neck stiffness, but his initial CT head is normal. What is the next investigation to confirm the likely diagnosis?

Accepted Answer

Lumbar puncture

Answer

MRI brain

Answer

MR venography

Answer

Digital subtraction angiography

Answer

Repeat CT scan in 24 hours

Practice question

A 55-year-old man suddenly develops a severe headache described as 'thunderclap' in onset. He is photophobic and has neck stiffness, but his initial CT head is normal. What is the next investigation to confirm the likely diagnosis?