Cervical diastematomyelia.
D003951:Diagnostic Errors; D006801:Humans; D009135:Muscular Diseases / Q000150:complications*; D009436:Neural Tube Defects / Q000175:diagnosis*; D009999:Ossification, Heterotopic / Q000150:complications*; D013117:Spinal Cord Compression / Q000209:etiology*