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.
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Papilledema is a swelling of the optic nerve, at the point where this nerve joins the eye, that is caused by an increase in [more]Papilledema - Community and Resources

Noun
1. swelling of the optic disc (where the optic nerve enters the eyeball); usually associated with an increase in intraocular pressure
(hypernym) edema, oedema, hydrops, dropsy

Swelling around the optic nerve, usually due to pressure on the nerve by a tumor.

[pap-il-eh-DEE-ma]
Swelling around the optic disk, the area where the optic nerve (the nerve that carries messages from the eye to the brain) enters the eyeball. Papilledema occurs when increased brain pressure caused by tumors or other problems results in swelling of the optic nerve.