A brain injury that affects only a single area of the brain is called what?

• A. Diffuse injury
• B. Global injury
• C. Mixed injury
• D. Focal injury

Answer: (D)

A focal injury is a brain injury that affects a single, localized area. This happens when the impact damages only one specific region, such as a contusion or localized bleeding, so the resulting deficits tend to mirror the functions of that particular area. In contrast, a diffuse injury involves widespread damage across many brain regions (like diffuse axonal injury), leading to more global impairment. The term global is less precise, and a mixed injury would imply both localized and widespread damage. So when the damage is confined to one area, the correct description is a focal injury.