en Basic Neurosurgery Case report <div style="text-align: justify;"><strong>Background and Importance</strong>: The novel SARS-CoV-2 virus has had an undeniable effect worldwide in different aspects. Although cerebrovascular diseases, especially subarachnoid hemorrhage (SAH), have already been reported in COVID-19 patients, little is known about various types and patterns of SAH in these patients.<br> <strong>Case Presentation:</strong> A 63-year-old woman was admitted to the emergency department with a headache. Her headache was severe (Hunt and Hess score, grade 2). She was diagnosed with COVID-19 by a positive nasopharyngeal swab PCR test. Her CT scan revealed a perimesencephalic hemorrhage, thick SAH without any signs of hydrocephalus or intraventricular hemorrhage.<br> <strong>Conclusion:</strong> Regarding the different associations of SAH with COVID-19, the perimesencephalic hemorrhage in our case is a novel type. Although not uncommon among non-infected populations, SAH occurrence in COVID-19 patients has not been reported before and needs further investigation.</div> <div> <div><div id="_com_1" uage="JavaScript"></div></div> </div> Subarachnoid Hemorrhage, Headache, COVID-19 213 218 http://irjns.org/browse.php?a_code=A-10-449-1&slc_lang=en&sid=1 Mohammad Kazem Sarpoolaki kazmo885@gmail.com 10031947532846007395 10031947532846007395 No Neurosurgery Department, Imam Khomeini Hospital Complex, Tehran University of Medical Sciences, Tehran, Iran Arad Iranmehr 10031947532846007396 10031947532846007396 No Neurosurgery Department, Imam Khomeini Hospital Complex, Tehran University of Medical Sciences, Tehran, Iran Mohammad Ali Bitaraf 10031947532846007397 10031947532846007397 No Neurosurgery Department, Imam Khomeini Hospital Complex, Tehran University of Medical Sciences, Tehran, Iran Soheil Naderi 10031947532846007398 10031947532846007398 No Neurosurgery Department, Imam Khomeini Hospital Complex, Tehran University of Medical Sciences, Tehran, Iran Mohamad Namvar mohamad.namvar@gmail.com 10031947532846007399 10031947532846007399 Yes Neurosurgery Department, Imam Khomeini Hospital Complex, Tehran University of Medical Sciences, Tehran, Iran