Cerebrospinal fluid, Diagnostic procedure, MR, Neuroradiology brain
A. Hilario Barrio, E. Salvador, P. Martín Medina, L. Koren, G. Ayala, A. Martinez de Aragon, J. M. Millan, F. Ballenilla, A. Ramos Gonzalez; Madrid/ES
Intracranial pressure (ICP) can be estimated by measurement of the cerebrospinal fluid (CSF) opening pressure at lumbar puncture.
In the steady state,
pressure within the brain parenchyma and intracranial extra-axial spaces are equal.
ICP increases with Valsalva maneuver,
and falls bellow atmospheric pressure in the standing position.
The Monro-Kellie doctrine describes the relationship among volumes and pressures in the intracranial space.
Is is based on the principle that,
within the fixed volume of the intracranial and intraspinal spaces,
the total volume of CSF,
brain and spinal cord,
and intracranial and intraspinal blood volume remains appoximately constant.
A change in the volume of any one of the compartments is offset by compensatory changes in the other two compartments.
Our objectives were to describe imaging findings reported in idiopathic intracranial hypertension (IHH) and spontaneous intracranial hypotension (SIH) discussing their possible roles in pathophysiology.