Selective anterior cervical gas myelography by the lateral approach.

In order to observe pathological changes in the anterior cervical subarachnoid space with the least disturbance to the patient by gas myelography, needle puncture into the cervical spinal subarchnoid space was performed between the arch of C1 and the lamina of C2 with the patient in a horizontal supine position, gas was introduced selectively into the anterior cervical spinal subarachnoid space.