Patients with herniated discs may have the following manifestations during CT: first, there will be small intravertebral canal occupations, and in the position near the anterior vertebral body, there will be protrusions of relatively small density of bone in the interstices between adjacent vertebral bodies. This kind of material is basically the density of cartilage after density probing, and after its protrusion may cause relevant pressure on the contents of the spinal canal. In some cases of severe protrusion, these protrusions may even be seen completely detached and free inside the spinal canal. Second, compression of the spinal cord or nerve roots may be seen. When this type of CT is taken, the spinal cord and nerve roots tend to show up more clearly, with a zigzag distribution within the spinal canal, and sometimes there is an obvious slightly higher density of compressed material on the surface of the nerve roots or spinal cord, which is the intervertebral disc. Third, there may be a narrowing of the intervertebral space, as seen in the sagittal scan, the intervertebral space of the adjacent vertebrae can be seen to be significantly narrowed, and there may be osteophytes.