Lumbar epidural gas is a rare phenomenon where gas locules are observed within the spinal canal of the lumbar spine. It can arise from a number of factors:
due to regional degenerative disc disease with or without dorsal epidural disc migration: thought to be from gas leaking from the disc space to the epidural area through the tears of annulus fibrosus, occurring mostly with herniated fragments 4
traumatic pneumorrhachis
postoperative pneumorrhachis
from a degenerative spinal synovial cyst
from a gas containing herniating regional ganglion cyst
iatrogenic from lumbar epidural injection using the air release technique
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