 Patients diagnosed with chronic subdural hematoma on CT scan, will be operated on as soon as possible. The type of operation will be determined by randomization. The duration of surgery as well as presence of brain reexpansion in case of burr hole or minicraniotomy will be recorded. Postoperatively, patients will be transferred to the neurosurgery ward with a subdural drainage system in place. Drainage system is removed 48 to 96 hours postoperatively, regardless of the type of operation 48 hours standard; longer period of drainage if drainage less than 50cc24h evaluated on the second 24 hours postoperatively. Maximal time of continuous drainage is 4 days or 96 hours postoperatively. Drained volume will be recorded. Evaluation will be performed preoperatively, 48h postoperatively, on discharge, after 6 weeks and after 6 months, and will include: 