I would never expect them to return what was withdrawn. It might become contaminated after removal and reinsertion may cause meningitis. The body tissues of the choroid plexus inside the brain creates CSF naturally at a steady rate from the body serum.
Answered 8/24/2023
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These procedures predate modern imaging such as an MRI, and were very uncomfortable. Back then, the air was gradually replaced by spinal fluid over 30-60 minutes by standard CSF production, and proper fluid balance was restored by the body. What issues prompt your concerns after all this time?
Answered 9/4/2023
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