Case report: Development of syringomyelia after anatomically successful craniovertebral decompression for Chiari I malformation without syrinx

An 18 year old female with headaches and radiologically confirmed Chiari I malformation, without syringomyelia, underwent an anatomically and clinically successful craniovertebral decompression. Five years later she returned with extensive syringomyelia. This was treated successfully by division of an arachnoid web at the foramen of Magendie.