Embolization of the Middle Meningeal Artery for the Prevention of Chronic Subdural Hematoma Recurrence in High Risk Patients (EMPROTECT)

Inclusion Criteria: Patient: * Aged ≥ 18 years * Operated for a SDH recurrence or operated for a first episode of SDH if at least one of the following recurrence risk factors is present: * Chronic alcoholism defined by a daily alcohol consumption \> 30g/day * Or liver cirrhosis * Or antiplatelet therapy * Or anticoagulant therapy * Or thrombocytopenia with a platelet count \< 100 x10(3) per µL * Or surgery without use of external drain * With affiliation to a social security scheme * Having signed an informed consent form or for whom a delegate close relative or a support person has signed an informed consent Exclusion Criteria: * SDH evacuation by craniotomy or twist-drill craniostomy rather than burr-hole surgery * Beyond 7 days after the index surgery (surgery for recurrent SDH or first surgery in case of a risk factor as indicated in the inclusion criteria) * Functionally dependant patient with an mRS score ≥ 4 before the SDH * Patient with a life expectancy \< 6 months * Patient with renal failure as defined by a creatinine clearance \< 30 ml/min * Pregnancy * History of allergy to a iodinated contrast agent * Procedure deemed unachievable under local anesthesia (because of patient agitation or discomfort for instance) in a patient with a contraindication to both conscious sedation and general anesthesia. * Patient refusal * Patient for whom follow-up is deemed problematic (living abroad or homeless for instance ) * Patients under legal guardianship or trusteeship