Abnormal nervous system physiology Abnormality of intracranial pressure 2014-01-19T08:06:51Z A deviation from the norm of the intracranial pressure. UMLS:C4022809 HP:0012640 Intracranial pressure (i.e., the pressure inside the skull) represents the pressure in the brain tissue and in the cerebrospinal fluid (CSF). Deviations from normal are generally identified by measuring the pressure of the CSF.