If a Lumbar Puncture is done on the lower back, then how does a LP measure intracranial pressure inside the skull & around the brain?

If a Lumbar Puncture is done on the lower back, then how does a LP measure intracranial pressure inside the skull & around the brain?

submitted by /u/FrappeLover2020
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source https://www.reddit.com/r/Radiology/comments/luru8f/if_a_lumbar_puncture_is_done_on_the_lower_back/