This study is for people aged 40-90 who have chronic subdural hematoma (CSDH), a condition where blood collects under the outer covering of the brain. The study compares two treatments: **Middle Meningeal Artery Embolization (MMAE)**, which blocks blood flow to the problem area, and **conventional open surgery**, which physically removes the blood.

Participants will share their medical history, have blood tests, head CT scans, and answer surveys. They will also receive either MMAE or conventional surgery. Researchers want to see if MMAE is as safe as surgery and if it reduces the need for more surgery or prevents deaths.

• The study involves several tests and a treatment (MMAE or surgery).
• Participants must be willing to follow the study procedures and provide informed consent.
• There are specific health criteria to join, and some medical conditions may exclude participation.