Lumbar subarachnoid space

What does "Lumbar subarachnoid space" mean in a report or doctor's letter? In our medical dictionary, you will find a patient-friendly explanation of the meaning of this medical term.

Explanation

The lumbar subarachnoid space is a part of the lower back area. It is a space that surrounds the spinal cord and is filled with a fluid that helps protect the brain and spinal cord. This space is important because it is often where doctors insert a needle during a procedure called a lumbar puncture to collect this fluid for testing.

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