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Low Back Pain - Classic Lumbar Disc Herniation. Accurately depicts a typical intervertebral lumbar disc progressing from a normal condition to full disc herniation and nerve root impingement. Shows normal lumbar disc anatomy followed by three variations of disc bulging and herniations (lateral and posterior).  Labeled structures include nucleus pulposus, annulus fibrosus, spinal nerve root compression, disc bulging, spinous processes, dura mater (thecal sac) and cauda equina compression.