Middle Meningeal Artery (MMA) Embolization Compared to Traditional Surgical Strategies to Treat Chronic Subdural Hematomas (cSDH)

Inclusion Criteria: * Age 18 or older * Participant or Surrogate must be English speaking * Subjects must have a diagnosis of chronic or acute-on subdural hematoma based on brain imaging, as documented by an * One or more symptoms attributable to chronic SDH including headache cognitive impairment, gait instability, seizure, or mild focal neurologic deficit. * In opinion of Investigator or the subject's referring physician, the subject has failed conservative management. Exclusion Criteria: * The Subdural hematoma is causing mass effect significant enough to cause marked or progressive neurologic impairment * Any requirement for urgent surgical evacuation is necessary * Life expectancy is less than 6 months in the opinion of the subject's primary physician * Markedly tortuous vasculature precluding safe endovascular access, as assessed on angiogram * Acute subdural hematomas * Health insurance doesn't cover MMA embolization or performing Surgeon and follow up visits are considered out of network. * Pregnancy