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It consists of a downward displacement of the cerebellar tonsils and the medulla through the foramen magnum, sometimes causing hydrocephalus as a result of obstruction of cerebrospinal fluid outflow.

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It consists of a downward displacement of the cerebellar tonsils through the foramen magnum ( the opening at the base of the skull ), sometimes causing non-communicating hydrocephalus as a result of obstruction of cerebrospinal fluid ( CSF ) outflow.

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