Abstract
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.
Disclosure statement
The author reports no conflicts of interest. The author alone is responsible for the content and writing of the article.