Neurologic complications of gas myelography by the lumbar route.

Gas myelography is not a new technique, but its acceptance in neuroradiologic diagnosis has been relatively recent. Previously reported series have emphasized the benign nature of this technique and the lack of significant accompanying complications. From a series of 174 gas myelograms performed during a four-year period, two reports are presented wherein transient exacerbation of neurologic deficit followed exchange of cerebrospinal fluid and gas under pressure by the lumbar route. One patient with cervical spondylotic myelopathy experienced an increase in paresis, while another was found to have marked fasciculations. Speculation regarding possible mechanisms involved with these complications is presented. It is suggested that exchange of cerebrospinal fluid and gas under pressure via the lumbar route be used with caution in those patients with compromised cervical spinal cords.