Klippel-Feil syndrome
Background
Klippel-Feil syndrome is a rare disorder caused by failure of the division of the bones in the cervical (neck) section of the spinal column during embryonic development.
Three types of Klippel-Feil syndrome have been described and these depend upon the number of vertebrae joined together and whereabouts in the spine they are joined.
Type I involves fusion of the bones in the neck and the upper part of the back.
Type II is the commonest type of Klippel-Feil syndrome and involves the whole spine from the neck down to the low back. Commonly, two or three bones are joined together, but there may also be some abnormally shaped vertebrae such as hemi-vertebrae (this means the absence of half a bone).
Type III involves almost the whole of the spine from the neck down to the lower back.