ZEPHYR / SCIENCE PHOTO LIBRARY ZEPHYR / SCIENCE PHOTO LIBRARY
Spondylolisthesis. Coloured 3D computed tomography (CT) scan of a section through the lumbar (lower back) spine of a 39-year-old patient with spondylolisthesis. Spondylolisthesis is the anterior or posterior displacement (blue) of a vertebra or the vertebral column in relation to the vertebrae below.
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