Klippel-Feil anomaly associated with thoracic hemivertebrae/butterfly vertebrae and patella hypoplasia.

A case with multiple congenital anomalies of the spine and bilateral patella hypoplasia is reported. To our knowledge, no report of concomitant Klippel-Feil syndrome, thoracic hemi vertebrae/butterfly vertebrae bilateral patella hypoplasia, reducible atlantoaxial instability, and occipitoatlantal fusion simultaneously has been reported in the literature.