Raised intracranial pressure is caused by intracranial lesions causing an increased volume of blood, CSF or parenchymal tissue.
The pressure in the cranial vault is measured in millimeters of mercury (mm Hg) and is normally less than 20 mm Hg.
The cranium is a rigid structure that contains three main components: brain, cerebrospinal fluid, and blood. Any increase in the volume of its contents will increase the pressure within the cranial vault.
Reference
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