High-energy injuries to the head occur when the head hits against another object with great force or pressure. This type of injury puts a person at increased risk for a brain injury, even when there is no visible external bleeding or other obvious sign of injury.
High-energy injuries to the head can occur in a variety of ways, including:
Injuries to the neck or face are more likely to occur with a high-energy head injury.
WebMD Medical Reference from Healthwise