Introduction: Incidence of atraumatic subarachnoid hemorrhage (SAH) is decreasing over time and its treatment is changing. We reported epidemiologic data on aneurysmal (a-) and non-aneurysmal (na-) SAH over 10 years.
Patients And Methods: Our prospective population-based registry included patients with first-ever SAH occurring from January 2011 to December 2020.