De novo syrinx formation in a patient with type I Chiari malformation: Case report and review of the literature

This report highlights the case of a 56-year-old woman with an incidental type I Chiari malformation who on initial presentation had no associated cervical syrinx on magnetic resonance imaging (MRI), but who on subsequent MRI 8 years later was found to have developed a de novo upper cervical cord syrinx.