Chiari I malformation with associated hydrosyringomyelia and Klippel-Feil syndrome



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 a 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