Klippel-Feil Syndrome (KFS) is a complex congenital syndrome of osseous and visceral anomalies. It is mainly associated with multi-level cervical spine fusion with hypermobile normal segments. Therefore, a patient with KFS can be at risk of severe neurological symptoms even after a minor trauma. We report a patient with type III KFS who developed a hemiparesis after a minor trauma and was successfully managed with operation.