Migrating radicular pain caused by gas-collection in the lumbar epidural region: case report.

Finding gas into the intervertebral disc space is a relatively common occurrence, whereas lumbar disc herniations containing gas or lumbar epidural gas-collections are rarely observed. The Author reports a very rare case of a patient who first suffered from right-side sciatica and then, a few months after being treated, from left-side cruralgy; both symptoms were found to be caused by epidural gas-collection at different levels of the spinal canal.