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spinal tap
(SPY-nul ...)
A procedure in which a thin needle called a spinal needle is put into the lower part of the spinal column to collect cerebrospinal fluid or to give drugs. Also called lumbar puncture.
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 is inserted into the lower part of the spinal column to remove cerebrospinal fluid (CSF, shown in blue). The fluid may be sent to a laboratory for testing.','popup','width=780,height=630,scrollbars=1,resizable=1,menubar=0,location=0,status=0,toolbar=0'))
