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The methodology for continuous monitoring intracranial pressure (ICP) being presently employed in the Neurosurgery Service of the University of Pennsylvania is presented. The methods are intraventricular recording of ICP (IVP) and subarachnoid recording of ICP (SaP). The indications for employing either method are briefly presented. IVP is favored in those situations in which the lateral ventricles are enlarged and SaP is preferred in the cases of brain swelling or other situations in which there is a small ventricular system.