What sort of disease is chiari syndrome?

Three types. Chiari malformations come in three types (i, ii, and iii). Type i is, by far, the most common. There is a hole at the bottom of the skull where the spinal cord exits (the foramen magnum). If the back part of the skull is not large enough to house the cerebellum, the lower portion of the cerebellum can push through the foramen magnum and into the spinal canal - this is a chiari i malformation.