SAH examination is the first choice, and most patients can preliminarily predict the location of aneurysm through brain ct. CT angiography, especially 3D-CTA, can be the first choice in emergency.
2. Lumbar puncture
The most sensitive detection method of SAH is not commonly used at present.
3. Digital subtraction angiography
The gold standard for diagnosing intracranial aneurysms can show the size, location, shape and existence of multiple aneurysms.