cervical vertebrae. The true incidence of Klippel-Feil Syndrome is unknown. The most common signs are short neck, low hairline at the back of the head, and restricted mobility of the upper spine. Studies have shown that 34% to 74% of Klippel-Feil Syndrome patients present with such findings. Seventy-five human C2 specimens of both sexes were examined for Klippel-Feil Syndrome. During the osteologic examination for Klippel-Feil Syndrome, we noticed two adult specimens with congenital fusion of C2 and C3 vertebrae.
