Lumbar puncture. A patient lies in a curled position on a table. After a small area on the lower back is numbed, a spinal needle (a long, thin needle) 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.
Source: NCI (NIH)1
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- Source: NCI (NIH): cancer.gov/ types/ brain/ patient/ child-brain-treatment-pdq
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