An abscess on the brain is a collection of pus that forms as a result of an infection or trauma. It’s still a dangerous and perhaps fatal condition. The consequences vary based on the size and location of the abscess in the brain. In the United States, between 1,500 and 2,500 instances occur each year. Adult men under the age of 30 are the most susceptible to brain abscesses. Children between the ages of 4 and 7 are the most likely to develop them. Newborns are also vulnerable. The prevalence of brain abscesses in young children has decreased as a result of vaccination campaigns.