The term “disc material” refers to the material that makes up the intervertebral discs, which are located between the vertebrae of the spine and act as shock absorbers. The discs consist of an outer layer called the annulus fibrosus and an inner gel-like substance called the nucleus pulposus. In some cases, the disc material may herniate or rupture, which can cause pressure on the nerves or spinal cord and result in pain or other symptoms.