Congenital anomalies of the upper cervical spine.
D001139:Arnold-Chiari Malformation / Q000196:embryology / Q000473:pathology / Q000601:surgery; D001368:Axis, Cervical Vertebra / Q000002:abnormalities* / Q000196:embryology; D001270:Cervical Atlas / Q000002:abnormalities* / Q000196:embryology; D006801:Humans; D007714:Klippel-Feil Syndrome / Q000601:surgery; D013116:Spinal Cord / Q000002:abnormalities / Q000196:embryology / Q000601:surgery