What is the definition or description of: pseudotumor cerebri?

Pseudotumor cerebri: This is a condition when pressure within the skull (intracranial pressure) increases without an obvious reason why. It's calle "pseudotumor" because the symptoms can mimic those of having a tumor or something compressing the brain. Headaches and visual problems tend to be among the more common symptoms. Often diagnosis can be made or suggested by noting changes in the eye with an ophtalmoscope