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Abstract

MR Evaluation of Chiari I Malformations at 0.15 T

Efstathios Spinos, D. Wayne Laster, Dixon M. Moody, Marshall R. Ball, Richard L. Witcofski and David L. Kelly
American Journal of Neuroradiology March 1985, 6 (2) 203-208;
Efstathios Spinos
1Department of Radiology, Bowman Gray School of Medicine, Wake Forest University, 300 S. Hawthorne Rd., Winston-Salem, NC 27103. Address reprint requests to D. W. Laster
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D. Wayne Laster
1Department of Radiology, Bowman Gray School of Medicine, Wake Forest University, 300 S. Hawthorne Rd., Winston-Salem, NC 27103. Address reprint requests to D. W. Laster
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Dixon M. Moody
1Department of Radiology, Bowman Gray School of Medicine, Wake Forest University, 300 S. Hawthorne Rd., Winston-Salem, NC 27103. Address reprint requests to D. W. Laster
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Marshall R. Ball
1Department of Radiology, Bowman Gray School of Medicine, Wake Forest University, 300 S. Hawthorne Rd., Winston-Salem, NC 27103. Address reprint requests to D. W. Laster
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Richard L. Witcofski
1Department of Radiology, Bowman Gray School of Medicine, Wake Forest University, 300 S. Hawthorne Rd., Winston-Salem, NC 27103. Address reprint requests to D. W. Laster
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David L. Kelly Jr.
2Department of Surgery, Section of Neurosurgery, Bowman Gray School of Medicine, Wake Forest University, Winston-Salem, NC 27103
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Abstract

Twelve patients with known or presumed Chiari I malformations and two with clinical diagnoses of multiple sclerosis were examined by magnetic resonance (MR) imaging. MR confirmed or established the diagnosis of Chiari I malformation in all 14 cases. The spin-echo technique with a short time to echo (TE = 40 msec) and a short time to recover (TR = 1000 msec) provided optimum imaging of tonsillar position, hydromyelia cavities, and cervicomedullary “kinking.” Long TE (>80 msec) and TR (>2000 msec) increase the signal intensity of cerebrospinal fluid and may obscure the pathology. Sagittal, transaxial, and coronal images provided complementary data; sagittal and coronal views best imaged the abnormal spinal cord and tonsils, but slitlike cavities were best seen on transaxial images. Cervicomedullary kinking was found in 10 (71%) of 14 patients and in 90% of the hydromyelic patients. This high incidence suggests that in other radiologic techniques tonsillar herniation masks the kinking. Symptoms of the Chiari I malformation overlap those of demyelinating diseases and brain tumors. Our early experience suggests MR is the preferred noninvasive procedure for identifying Chiari I malformation. Moreover, the ability to portray the variable cavity morphology of hydromyelia directly offers the potential for improved shunt placement.

  • © American Roentgen Ray Society
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American Journal of Neuroradiology
Vol. 6, Issue 2
1 Mar 1985
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MR Evaluation of Chiari I Malformations at 0.15 T
Efstathios Spinos, D. Wayne Laster, Dixon M. Moody, Marshall R. Ball, Richard L. Witcofski, David L. Kelly
American Journal of Neuroradiology Mar 1985, 6 (2) 203-208;

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MR Evaluation of Chiari I Malformations at 0.15 T
Efstathios Spinos, D. Wayne Laster, Dixon M. Moody, Marshall R. Ball, Richard L. Witcofski, David L. Kelly
American Journal of Neuroradiology Mar 1985, 6 (2) 203-208;
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