Aspirin Continuation or Discontinuation in Conservative Treatment for Chronic Subdural Hematoma

Inclusion Criteria: * Age ≥18 years, male or female; * Confirmed diagnosis of chronic subdural hematoma (cSDH) by cranial CT and/or MRI; * Intended for conservative management (i.e., no surgical evacuation indication at enrollment); * Regular aspirin use at enrollment; * Informed consent signed by the patient or legal representative. Exclusion Criteria: * Patients requiring emergency surgery to remove hematoma at enrollment; * Concurrent use of other anticoagulants or antiplatelet agents that cannot be discontinued according to the study protocol; * cSDH secondary to other diseases or conditions (e.g., excessive drainage from ventriculoperitoneal shunts, intracranial tumors); * Active bleeding events or major cardiac events (e.g., acute myocardial infarction, unstable angina, or revascularization surgery) within 30 days prior to enrollment; * Known bleeding disorders (e.g., hemophilia, severe thrombocytopenia); * Individuals unable to provide informed consent or for whom completion of follow-up is anticipated to be difficult.