Symptomatic Spinal Epidural Gas-Containing Cystic Lesions: Reports of 2 Cases

non of the intervertebral disc space, a gas-containing cyst in the epidural space is a rare disease entity. Intervertebral gas can migrate to the epidural space through ruptures in the annulus fibrosus, and it manifests as squeezed air in the herniated disc, as contained air in the pseudocyst that is without a larger amount of disc material, or as free air. There have been several reports about gas collections in the spinal canal that are associated with disc degeneration (1-7). These intraspinal gas collections were actually gas-containing disc herniations or collections of epidural leaked gas from the adjacent disc. However, a symptomatic epidural gas-containing cyst has been rarely reported on. The reason for this scarcity of reports is attributed to the fact that most of the epidural gas collections are related to interventional procedures like epidural pain block, and many radiologists neglect small amounts of epidural gas collections as being natural things. We recently experienced two cases of epidural gas-containing cysts with concomitant radiculopathy. Herein, we present the radiographic findings of these 2 cases of epidural gas-containing cysts.