- Literally, a disease process that affects roots and peripheral nerves.
- A nontraumatic, usually sporadic, generalized disorder of nerve roots and peripheral nerves, which may affect motor fibers or sensory fibers, but usually both, although often not to the same degree; classified as axon degenerating (axonal) or demyelinating. This disorder has many causes, primarily immune mediated, and includes Guillain-Barré syndrome and chronic inflammatory polyneuropathy.
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