 The microscope was brought in and using the Midas Rex drill with the AM-8 bit and removing some of the spinous process of L1-L2 with double-action rongeurs, the laminotomy was then done using the drill and great care was taken and using a 2-mm rongeur, the last layer of lamina was removed exposing the epidural fat and dura. 
The microscope was brought in and using the Midas Rex drill with the AM-8 bit and removing some of the spinous process of L1 - L2 with double - action rongeurs , the laminotomy was then done using the drill and great care was taken and using a 2 - mm rongeur , the last layer of lamina was removed exposing the epidural fat and dura .