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January 1981

Contrast Dose in CT Scanning

Author Affiliations

Department of Neurology University of Nebraska College of Medicine 42nd Street and Dewey Avenue Omaha, NE 68105

Arch Neurol. 1981;38(1):67-68. doi:10.1001/archneur.1981.00510010093029

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To the Editor.—  The article by Marano et al (Archives 1980;37:523-524) brought to mind a recent experience. A 46-year-old woman was admitted because of a four-day history of "falling to the left." Onset had been gradual, and there were no obvious precipitants or associated symptoms. Examination showed a variable horizontal, jerk nystagmus, which became prominent on left lateral gaze. Her gait was ataxic, and her stance confirmed a tendency to fall toward the left. Mild rift, as well as dysmetria and dysdiadochokinetic errors of the left extremities, were noted. Plantar responses were extensor bilaterally.An initial computerized tomographic head scan was considered indeterminate because of asymmetry and questionable enhancement of the right centrum semiovale (Fig 1). No posterior fossa

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