*What are Minor Cases? Diagnostic angiography, Nerve/Muscle Bx, tracheostomy; implantation of programable battery units for VNS or DBS, EFO electrodes, halo/tongs, ICP monitor, many revise-incision cases, or ventriculostomy. Minor cases also include removal of most CSF shunts, DBS electrodes, SAS pumps, as well as removal of subdural EEG strip electrodes, or spinal cord stimulators.