HYDROMYELIA ASSOCIATED WITH A POSTERIOR-FOSSA CYST

There are rare reports of children with hydromyelia in association wit h arachnoid cysts at the foramen of Magendie, and these cases have uni formly been associated with hydrocephalus. We report a case of a 45-ye ar-old woman with a posterior fossa cyst associated with hydromyelia a nd normal ventricles. This was successfully treated with a cystoperito neal shunt. We believe this unusual condition is of interest in elucid ating potential mechanisms of hydromyelia.