On January 17, 2025, 65-year-old Mr. Qiu visited the Affiliated People's Hospital of Ningbo University complaining of dizziness that had lasted for three days. Dizziness is common among the elderly and can stem from insufficient cerebral blood supply, cervical spine issues, or blood pressure fluctuations. The doctor ordered color Doppler ultrasound and plain CT scans, both of which showed no obvious abnormalities. Mr. Qiu should have been sent home to rest—but then AI raised an alert.