postoperative magnetic resonance imaging of lumbar spine: mass of L5-S1 intervertebral disc space
postoperative magnetic resonance imaging of lumbar spine: mass of l5-s1 intervertebral disc space
postoperative magnetic resonance imaging of lumbar spine: mass of L5-S1 intervertebral disc space (procedure)
postoperative magnetic resonance imaging of lumbar spine: mass of l5-s1 intervertebral disc space (procedure)