Which diagnostic study is the most reliable to identify the source of a subarachnoid…

➤ When is magnetic resonance angiography appropriate in suspected subarachnoid hemorrhage?
Magnetic resonance angiography suits patients who need to avoid ionizing radiation or iodinated contrast and works well for follow-up of larger aneurysms. In the acute setting, MRA is generally less sensitive than CTA or DSA for small or complex lesions, so it is not the first-line test in unstable or high-risk acute SAH.