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Klippel-Feil sequence: Short neck, low hairline at the nape of the neck and limited movement of the head. Klippel-Feil sequence is due to a defect in the early development of the spinal column in the neck, resulting in fusion of the rel=dict cervical vertebrae. The condition is named for the French neurologists Maurice Klippel and Andre Feil who in 1912 reported A case of absence of the cervical vertebrae with the rel=dict thoracic cage going up to the base of the skull.
Klippel-Feil sequence is now the preferred name for the condition. It has gone by many other names including rel=dict congenital brevicollis, rel=dict congenital cervicothoracic vertebrae synostosis, rel=dict congenital osseus-torticollis syndrome, rel=dict congenital webbed neck syndrome, rel=dict congenital synostosis of cervicothoracic vertebrae syndrome, congenital rel=dict osseous-torticollis syndrome, rel=dict dystrophia brevicollis congenita, rel=dict Klippel-Feil anomalad, rel=dict Klippel-Feil anomaly, rel=dict Klippel-Feil deformity, rel=dict Klippel-Feil phenotype, and rel=dict Klippel-Feil syndrome.