Klippel-Feil Syndrome (KFS)

Klippel–Feil syndrome (KFS), also known as cervical vertebral fusion syndrome, is a rare congenital condition characterized by the abnormal fusion of any two of the seven bones in the neck (cervical vertebrae).[1]:578 It results in a limited ability to move the neck and shortness of the neck, resulting in the appearance of a low hairline.[2]

The syndrome is difficult to diagnose, as it occurs in a group of patients affected with many different abnormalities who can only be unified by the presence of fused or segmental cervical vertebrae.[3] KFS is not always genetic and not always known about on the date of birth.

The disease was initially reported in 1884 by Maurice Klippel and André Feil from France.[4] In 1919, in his Doctor of Philosophy thesis,[5] André Feil suggested another classification of the syndrome, encompassing not only deformation of the cervical spine, but also deformation of the lumbar and thoracic spine.

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