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Removal of skull bone for removal or drainage of cyst of upper brain

Removal of skull bone for removal of growth of lower brain

Removal of skull bone for removal of growth of lower brain membrane

Removal of skull bone for removal of eighth cranial nerve brain growth

Release of middle or lower spinal cord and/or nerves, single segment

Removal of middle spine bone with release of spinal cord and/or nerves, lateral extra cavitary approach, single segment

Removal of lower spine bone with release of frayed spinal cord

Removal of upper spine bone and growth outside spine membrane

Removal of growth of middle spine bone outside spine membrane

Removal or biopsy of growth of middle spine bone outside spine membrane