Chest X-ray is recommended to assess other features of Klippel-Feil syndrome: e.g. Sprengel's deformity, omovertebral bone. An ultrasound abdomen to assess possible associated renal anomalies

This study shows a Chiari I malformation classified as stage 3 due hydrosyringomyelia.

• Classification of Chiari I:

  • stage I: asymptomatic (14-50%)

  • stage II: brainstem compression

  • stage III: hydrosyringomyelia

Two or more non-segmented cervical vertebrae are usually sufficient for diagnosis of Klippel-Feil syndrome. This case corresponds to type II. 

• Classification of Klippel-Feil syndrome: 

  • type I (9%): massive fusion of cervical and upper thoracic spine resulting in neurological impairment, frequent associated abnormalities

  • type II (84%): fusion of two or three vertebrae

  • type III (7%): cervical fusion with lower thoracic or lumbar vertebral fusion