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A to Z of neurological topics

In this section we feature information on a number of tests, treatments and conditions, with links for more information either within this website or on external sites where possible. If you can't find what you're looking for, you may wish to speak with one of our Helpline team who may be able to answer your questions. Send an email to [email protected] or call free on 0808 808 1000.

  • I



    If something is idiopathic it means that the cause is unknown.

    Idiopathic intracranial hypertension (IIH)


    Idiopathic intracranial hypertension is a condition in which the pressure of the fluid within the skull is increased but there isn’t a known or detectable cause. The increased pressure can lead to headaches, vision problems, and other symptoms.


    Useful links:

    Idiopathic Intracranial Hypertension UK

    Noninvasive ICP

    Interventional neuroradiologist


    A medical specialist that uses imaging techniques, such as MRI or CT scans, to precisely target a therapy. An interventional radiologist may perform procedures like coiling brain aneurysms or treating aneurysms via the blood vessels.

    Intracranial hypotension


    Intracranial hypotension is a condition in which the pressure of the fluid within the skull is lower than normal. This can lead to symptoms including headaches (that are often worse when standing), nausea, vomiting, and neck pain.


    Useful links:

    CSF Leak Association