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Refers to the low back region of the spinal column, which includes five bones, or vertebrae, labeled L-1 through L-5.
lumbar puncture
Also called spinal tap.
A minimally invasive diagnostic test that involves the removal of a small amount of cerebrospinal fluid—the fluid that surrounds the brain and spinal cord—or an injection of medication or another substance into the lumbar (or lower) region of the spinal column.
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