There are rare reports of children with hydromyelia in association with arachnoid cysts at the foramen of Magendie, and these cases have uniformly been associated with hydrocephalus. We report a case of a 45-year-old woman with a posterior fossa cyst associated with hydromyelia and normal ventricles. This was successfully treated with a cystoperitoneal shunt. We believe this unusual condition is of interest in elucidating potential mechanisms of hydromyelia.
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