Cervical compression of the dural sac: 1. It may be due to severe osteophytes in the cervical spine that compress the dural sac, causing the nerve roots or spinal cord to be stimulated and neurological symptoms to appear. 2. It may be due to hypertrophy of the ligamentum flavum, because the ligamentum flavum is located behind the spinal canal, and if there is degeneration and hypertrophy it can compress the dural sac, and in severe cases it can compress the spinal cord, causing neurological symptoms to appear. 3, It may be due to ossification of the posterior longitudinal ligament. If the posterior longitudinal ligament is ossified and sclerotic, it will compress the dural sac, and in severe cases, it will compress the spinal cord, resulting in severe neurological symptoms. 4. It is also due to cervical disc herniation. If the cervical disc herniation is severe and compresses the posterior dural sac, a semilunar image of the disc protruding into the spinal canal can be seen on MRI and CT. The dural sac is rounded and becomes depressed. Therefore, there are several causes of cervical dural sac compression. If this occurs, you must go to a regular hospital in time to improve the MRI of the cervical spine to clarify the severity of the disease, so that you can choose a reasonable treatment method to relieve the symptoms of dural sac compression in time and thus relieve the neurological complications it brings.