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What is a lumbar puncture?
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A lumbar puncture is a medical procedure in which a needle is inserted into the spinal canal to collect cerebrospinal fluid (CSF). CSF is a clear, colorless liquid that surrounds the brain and spinal cord. It contains proteins and other substances that help protect the central nervous system from injury. The lumbar puncture is used to diagnose certain neurological conditions such as meningitis or encephalitis.