A spinal tap, or a lumbar puncture, is a procedure in which a needle is inserted in your lower back to withdraw the cerebrospinal fluid (CSF) — the fluid around your spinal cord. The fluid can be ...

Subarachnoid hemorrhage (SAH) from ruptured intracranial aneurysms is a type of stroke that often results in death or permanent disability in most patients 1. Vasospasm occurs in approximately 70% of ...