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Lumbar Puncture

A lumbar puncture, which is also known as a spinal tap, is a medical procedure where a needle is inserted into the spinal canal, to collect cerebrospinal fluid for diagnostic testing or to administer chemotherapy drugs to treat leukemia.  

A lumbar puncture is primarily used to help diagnose diseases of the central nervous system.  It can also help diagnose serious infections, such as meningitis or cancer involving the brain or spinal cord.