- Torticollis Due to Bony Anomalies: 
- Klippel feil syndrome  
- atlantoociipital synostosis 
- basilar impression 
- odontoid anamalies 
- aplasia 
- hypoplasia 
- Os Odontoideum 
- occipital vertebrae  
- asymmetry of occipital condyles (hypoplasia) 
- absent C1 facet (unilateral) 
- fibrodysplasia ossificans 
- atlantoaxial rotary displacement 
- atlantorotatory fixation