Chiari measurement: The vertical distance from the tip of the cerebellar tonsils to a line drawn between and anterior and posterior margins of the foramen magnum. Normal is < 5 mm. The vertical distance from the tip of the cerebellar tonsils to a line drawn between and anterior and posterior margins of the foramen magnum. Case Discussion: The vertical distance from the tip of the cerebellar tonsils to a line drawn between and anterior and posterior margins of the foramen magnum. Normal less than 5mm. The vertical distance from the tip of the cerebellar tonsils to a line drawn between and anterior and posterior margins of the foramen magnum.
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