Background: Thunderclap headache and focal neurologic deficits are major diagnostic challenges to the neurologists. Besides subarachnoid hemorrhage and stroke. reversible cerebral vasoconstriction syndrome (RCVS) should be given high priority in the differential diagnosis. Case Report: A 46-year-old woman visited our hospital with thunderclap headache and left hemiparesis. https://www.hongmacro.com/product-category/petroleum-jelly/