The first patient has a history of head trauma. The second patient's CT scan did not reveal any substantive changes in brain tissue. The third patient may exhibit some clinical symptoms, such as transient consciousness disorders, typically lasting no more than half an hour. There is also recent memory loss; the patient cannot recall the incident. Additionally, the patient experiences self-reported symptoms of dizziness, headache, nausea, loss of appetite, insomnia, memory decline, and lack of concentration. With these medical histories, some CT scans, and symptoms, a concussion can be diagnosed.