Spinal stenosis is a narrowing of the spinal canal -- the passage for the spinal cord -- which in turn puts pressure on nerves, causing pain. Surgery is done to widen the passage and ease that pressure, typically by removing a bit of the vertebra.
Dr. Anthony Caputy, chairman of the hospital's neurosurgery department, is performing the operation.
Cheney is 68 years old. He has had four heart attacks.
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