<qa>  How many CTscans will be performed?- Imaging characteristics location frontalparietaloccipital, uni-bilateral, size max diameter, DensityHounsfield units, age of hematoma, membranes yn. An approximate total of five CTscans will be performed, totaling 5x210mSv of radiation exposure Length of hospital stay will be recorded. The primary endpoint will be the reoperation rate at 40 days. We hypothesize that subdural hematomas treated by minicraniotomy will require less reoperation reduced to 5 than burr hole craniostomy or twist drill craniotomy 15 to 25 according to literature. 