Brain tumor: Any abnormal tissue growth inside the brain; whether malignant (cancerous) or benign, brain tumors usually cause problems by the pressure they exert on the normal brain.
• Glioblastoma: An aggressive, cancerous brain tumor; glioblastomas progress rapidly and are usually difficult to cure.
• Hydrocephalus: An abnormally increased amount of cerebrospinal (brain) fluid inside the skull; usually, this is because the fluid is not circulating properly.
• Normal pressure hydrocephalus: A form of hydrocephalus that often causes problems with walking, along with dementia and urinary incontinence; pressure inside the brain remains normal, despite the increased fluid.
• Pseudotumor cerebri (false brain tumor): Increased pressure inside the skull with no apparent cause; vision changes, headaches, dizziness, and nausea are common symptoms.
