Abstract
Twenty-one cases of Arnold-Chiari malformation have been documented from cases seen at the National Hospital, Queen Square, from 1950 to 1964. The plain film appearances and changes on myelography. lumbar air encephalography, air ventriculography and Myodil ventriculography have been discussed. The advantages of myelography have been demonstrated. It is pointed out that at myelography the supine position may be the only way to show the herniated cerebellar tonsils, and that overt plain X-ray changes are not invariable in these cases.
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