Mainly it depends on what context it is used.
My research lead me to an interesting abbreviation which I believe it could be the answer to your question, or perhaps I am completely wrong.
IT: "Intrathecal is an adjective that refers to something introduced into or occurring in the space under the arachnoid membrane of the brain or spinal cord.For example, intrathecal immunoglobulin production means production of this substance in the spinal cord."
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