Papilloma of the choroid plexus is a rare benign type of choroid plexus tumor (see this term), accounting for 1% of all brain tumors, often occurring in the fourth ventricle (in adults) and the lateral ventricle (in children) but sometimes arising ectopically in the brain parenchyma, and presenting with nausea, vomiting, papilledema, abnormal eye movements, as well as enlarged head circumference, seizures and gait impairment due to an increase in intracranial pressure.