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In the medical world, the definition of foraminal is often given in reference to the foraminal canals, the narrow passageways that extend off the right and left side of each vertebra in the spine, allowing nerve roots to exit the spinal canal and travel throughout the body.
By Michael Perry, M.D. Bilateral neural foraminal narrowing may seem like a complicated medical term, but this condition has a fairly simple definition. In essence, the term means that nerve passageways in the spine â on both the right and left sides â have less space than they used to, possibly leading to the compression or pinching of nerves.