Effect and Safety Study of Atorvastatin to Treat Chronic Subdural Hematoma

Inclusion Criteria: 1. Age ≥ 18 and \<90 years old, male or female; 2. CT scan reveals supratentorial, unilateral or bilateral chronic subdural hematoma (MRI scan is warranted if diagnosis is difficult); 3. Markwalder's Grading Scale and Glasgow Coma Scale (MGS-GCS)\<Grade 3; 4. Attending physician makes a judgment that cerebral hernia would not occur and surgical operation might not be performed in a short time. Conservative treatment is adopted; 5. Patients have never undergo surgery on the hematoma 6. Patient fully understood the nature of the study, and voluntarily participates and signs informed consent. Exclusion Criteria: 1. Allergic to the statin or its ingredients 2. Cerebral herniation might occur at any time; 3. Hematoma leads to herniation and warrants surgical operation. 4. Hematoma caused by tumors, blood and other known comorbidities; 5. Abnormal liver function 6. Uncontrolled hepatitis and other liver diseases, as well as suffering from other disease may interfere the study 7. Patients have been on oral Statin treatment for a long time. 8. Patients have been on oral Steroids treatment for a long time. 9. Participate in clinical trials in the past four weeks; 10. Pregnant or breastfeeding 11. Failure of completing the trial by poor compliance; 12. For any reason, the researchers believe that the case is not suitable for inclusion.