Narrowing. A narrowing or "pinching" of the nerve canal.
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A small spine canal. When the overall cross sectional area of the spinal canal in any region of the spine for the neural tissue to be compressed leading to clinical symptoms/findings. This can be:congenital basis, degenerative one with aging or a result of a acquired reason like: cyst, tumor, hematoma, abcess, fracture or disc hrniation or a combination of above. Not all people with small canals get symptoms.