Neural foraminal stenosis refers to compression of a spinal nerve as it leaves the spinal canal through the foramen (the opening between the vertebrae through which spinal nerve roots travel and exit to other parts of the body). Neural foraminal stenosis may occur in either the lower back (lumbar spine) or the neck (cervical spine), and be caused by an osteophyte, a foraminal herniated disc, or collapse of the disc space.