Definition: Klippel-Feil Syndrome is a condition characterized by abnormal segmentation of the vertebrae in the cervical spine (neck region). Patients with Klippel-Feil have fused cervical vertebrae. Klippel-Feil was initially described prior to x-rays, therefore the original descriptions of classic Klippel-Feil consisted of the manifestations of:
- Decreased range-of-motion of the neck,
- A short, "webbed" neck, and
- A low hairline.

