A cervical spinal canal of 9mm is not normal and is cervical stenosis for adults, not necessarily stenosis for children, and specific symptoms need to be observed.
The normal value of cervical spinal canal sagittal diameter measured by CT is 12mm, below 12mm, it is developmental spinal stenosis, and less than 10mm, cervical spinal canal is absolute stenosis. The diameter of the cervical spinal canal in children becomes progressively larger with age, and the criteria for the diameter of the spinal canal in children have not yet been clarified.
Canal stenosis is usually caused by fractures, ossification of the posterior longitudinal ligament of the cervical spine, and cervical disc herniation. Spinal stenosis is usually accompanied by neck discomfort, limb pain, numbness and weakness.
It can also be accompanied by a feeling of constriction, which affects breathing and movement, as well as urinary and defecation disorders. To determine whether a child has cervical spinal stenosis, the diagnosis needs to be made in conjunction with the cause of the condition and its symptoms, as well as the results of an MRI.