Cerebral contusion.
A concussion refers to a brain injury that manifests as bruising of the brain accompanied by loss of consciousness. It occurs as a consequence of an injury, typically resulting from a blow to the head or a sudden jolt to the body. Concussions can vary in severity and may lead to a range of symptoms, such as headache, dizziness, confusion, memory problems, and nausea. It is important to seek immediate medical attention for proper evaluation and management of concussions, as they can have implications for both short-term and long-term neurological health.