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Papilledema
Papilledema (or papilloedema) is optic disc swelling that is caused by increased intracranial pressure. The swelling is usually bilateral and can occur over a period of hours to weeks. Papilledema occurs in approximately 50% of those with a brain tumour. Additional recommended knowledgeCauseAs the optic nerve sheath is continuous with the subarachnoid space of the brain (and is regarded as an extension of the central nervous system), increased pressure is transmitted through to the optic nerve. The brain itself is relatively spared from pathological consequences of high pressure. However, the anterior end of the optic nerve stops abruptly at the eye. Hence the pressure is asymmetrical and this causes a pinching and protrusion of the optic nerve at its head. The fibers of the retinal ganglion cells of the optic disc become engorged and bulge anteriorly. Persistent and extensive optic nerve head swelling, or optic disc edema, can lead to loss of these fibers and permanent visual impairment. DiagnosisChecking the eyes for signs of papilledema should be carried out whenever there is a clinical suspicion of raised intracranial pressure. Because of the (rare) possibility of a brain tumor, pseudotumor cerebri or cerebral venous sinus thrombosis, all of which can increase intracranial pressure, this examination has become common for patients suffering from headaches. PresentationThere are 10 hallmarks of papilledema:
Categories: Medical signs | Neurology |
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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Papilledema". A list of authors is available in Wikipedia. |