<qa>  What is the name of the subdural hematomas operated on by minicraSecondary endpoints: Clinical endpoints: Duration of operation, technical difficulties during operation. Duration of hospital stay. Improvement of Clinical status and speed thereof, Improvement of CT-imaging characteristics, complication rate bleeding, local or systemic infection, epilepsy,.... We expect that subdural hematomas operated on by minicraniotomy and large opening of membranes will lead to quicker improvement of CT-imaging than burr hole treatment or twist drill craniotomy. 