<qa>  What is the goal of this study?Setup of comparative trial The goal of this study is to determine whether one surgical treatment for chronic subdural hematoma is better than the other. Patients with a clear indication for drainage of subdural hematoma as stated under Surgical options will be randomized into three groups. One group will receive twist drill craniostomy followed by drainage during 48 hours. One group will undergo burr hole drainage single if possible, double if necessary with irrigation and drainage during 48 hours postoperatively. One group will undergo a minicraniotomy with trephine or craniotome, with wide opening of all visible membranes, rigorous irrigation and placement of Jackson-Pratt drain, followed by closed system draining during 48 hours. Postoperative results and complications will be compared between the three groups. 