CSF

Fluid within the four brain ventricles, mainly produced by the choroid plexus. The average pressure (in lateral recumbent position) is 150–250 mmH₂O, depending on CSF secretion and absorption, intracranial arterial and venous pressure, hydrostatic pressure, brain bulk, and status of surrounding coverings.

 Cancer Pain Management, Anesthesiologic Interventions, and Neural Blockade

 Headache due to Low Cerebrospinal Fluid Pressure