The regulations read " brain damage due to a blunt blow to the head; a penetrating head injury; crush injury resulting in compression to the brain; severe whiplash causing internal damage to the brain; or head injury secondary to an explosion. "  The Brain Injury Association of America also defines acquired brain injury, as a non-traumatic brain injury that causes damage to the brain by internal factors, such as a lack of oxygen, exposure to toxins, pressure from a tumor, etc.

Both of these definitions should be included.