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Abstract

Significance of cerebellar tonsillar position on MR.

A J Barkovich, F J Wippold, J L Sherman and C M Citrin
American Journal of Neuroradiology September 1986, 7 (5) 795-799;
A J Barkovich
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F J Wippold
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J L Sherman
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C M Citrin
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Abstract

It has been noted that a low degree of ectopia of the cerebellar tonsils on MR is of questionable significance. We measured the position of the cerebellar tonsils with respect to the inferior aspect of the foramen magnum in 200 normal patients and in 25 patients with a firm diagnosis of Chiari I malformation. In the normal group, the mean position of the tonsils was 1 mm above the foramen magnum with a range from 8 mm above the foramen magnum to 5 mm below. In the patients with Chiari I malformations, the mean position was 13 mm below the foramen magnum with a range from 3 mm below the foramen magnum to 29 mm below. Fourteen percent of normal patients had tonsils extending slightly below the foramen magnum. If 2 mm below the foramen magnum is taken as the lowest extent for tonsils in a normal patient, our sensitivity in predicting symptomatic patients is 100% and our specificity is 98.5% (three false positives). If 3 mm below the foramen magnum is taken as the lowest normal tonsillar position, our sensitivity is 96% and our specificity is 99.5%. MR demonstration of less than 2 mm of tonsillar ectopia is probably of no clinical significance in the absence of syringomyelia.

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American Journal of Neuroradiology
Vol. 7, Issue 5
1 Sep 1986
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Significance of cerebellar tonsillar position on MR.
A J Barkovich, F J Wippold, J L Sherman, C M Citrin
American Journal of Neuroradiology Sep 1986, 7 (5) 795-799;

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Significance of cerebellar tonsillar position on MR.
A J Barkovich, F J Wippold, J L Sherman, C M Citrin
American Journal of Neuroradiology Sep 1986, 7 (5) 795-799;
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Cited By...

  • Characteristics and Clinical Relevance of the Osseous Spur in Patients with Congenital Scoliosis and Split Spinal Cord Malformation
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  • Incidence of Cerebellar Tonsillar Ectopia in Idiopathic Intracranial Hypertension: A Mimic of the Chiari I Malformation
  • Incidental Findings on Brain Magnetic Resonance Imaging of Children With Sickle Cell Disease
  • Characterization of CSF Hydrodynamics in the Presence and Absence of Tonsillar Ectopia by Means of Computational Flow Analysis
  • Chiari I Malformation in the Very Young Child: The Spectrum of Presentations and Experience in 31 Children Under Age 6 Years
  • Phase-Contrast MR Imaging of the Cervical CSF and Spinal Cord: Volumetric Motion Analysis in Patients with Chiari I Malformation
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  • Pediatric Chiari I malformations: Do clinical and radiologic features correlate?
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