 Following this, we then made a transverse linear incision, the scalp galea was reflected and the quadrilateral bone flap was removed after placing burr holes in the midline and over the parietal areas directly over the tumor. 
Following this , we then made a transverse linear incision , the scalp galea was reflected and the quadrilateral bone flap was removed after placing burr holes in the midline and over the parietal areas directly over the tumor .