research Isolated Basilar Artery Reversible Cerebral Vasoconstriction Syndrome Associated with Finasteride and Vaping August 2024 RCVS should be considered in thunderclap headaches, and MRA and DSA are better for diagnosis than CT angiogram.
research Response July 2021 in “Clinical Medicine” The authors agree they didn't follow the original criteria strictly but found the Ottawa rule effective in all tested patients and suggest it might have wider use.
