Causes include the following: Brain tumor or abscess Cerebral trauma or hemorrhage Meningitis Arachnoidal adhesions Cavernous or dural sinus thrombosis Encephalitis Idiopathic intracranial hypertension (pseudotumor cerebri), a condition with elevated cerebrospinal fluid (CSF) pressure and no mass lesion Symptoms and Signs of Papilledema In patients with papilledema, vision is usually not affected initially, but seconds-long graying out of vision, flickering, or blurred or double vision may occur.