“…Children with Type I or Type III KlippelFeil syndrome usually suffer from severe accessory defects (Barnes, 1994); not all of them become manifest in bones. In the literature, abnormalities such as neck pain, hypomobility of the neck, fusion of the occipito-atlantal joint, basilar impression, eight cervical vertebrae (Gunderson et al, 1967), skoliosis (often caused by hemivertebrae; Resnick, 2002), renal anomalies, Sprengel's deformity, hearing impairment, synkinesis or heart defects (Hensinger et al, 1974), vasculopathies, diseases of the central nervous system and the skeletal system (Theiss et al, 1997) have all been reported. Furthermore, spina bifida, menigocele, deafness or deafmuteness is frequently mentioned (Everberg et al, 1962), as well as os odontoideum (this is a separation of the odontoid process from the body of the axis; Sherk & Dawoud, 1981).…”