In this procedure, the provider inserts a needle into one of the brain’s ventricles to withdraw cerebrospinal fluid, or CSF, for testing but does not inject any substance. The provider accesses the brain through the patient’s skull through a previously created burr hole, the fontanelle, or coronal suture, or through an internal ventricular drain. This service is done to measure pressure, remove excess fluid, and or collect fluid samples to analyze the CSF for neurological conditions.
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