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Brain abscess
brain abscess is a pus-filled swelling in the brain. It usually occurs when bacteria or fungi enter the brain tissue after an infection or severe head injury. 
Causes include infections in other parts of the body or an improperly functioning immune system.
Symptoms vary depending on the location of the brain abscess but may include headache and nausea from increased pressure in the brain. In rare cases, neurological symptoms may also be present.
Treatment includes antibiotics and close monitoring. In some cases, the abscess may need to be drained surgically.