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Abstract

The Utility of MR in Planning the Radiation Therapy of Oligodendroglioma

William P. Shuman, Brian R. Griffin, David R. Haynor, David C. Jones, J. Steve Johnson, Laurence D. Cromwell and George E. Laramore
American Journal of Neuroradiology January 1987, 8 (1) 93-98;
William P. Shuman
1Department of Radiology SB-05, University of Washington, Seattle, WA 98195. Address reprint requests to W. P. Shuman
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Brian R. Griffin
2Department of Radiation Oncology, University of Washington, Seattle, WA 98195
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David R. Haynor
1Department of Radiology SB-05, University of Washington, Seattle, WA 98195. Address reprint requests to W. P. Shuman
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David C. Jones
2Department of Radiation Oncology, University of Washington, Seattle, WA 98195
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J. Steve Johnson
2Department of Radiation Oncology, University of Washington, Seattle, WA 98195
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Laurence D. Cromwell
1Department of Radiology SB-05, University of Washington, Seattle, WA 98195. Address reprint requests to W. P. Shuman
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George E. Laramore
2Department of Radiation Oncology, University of Washington, Seattle, WA 98195
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Abstract

Newer methods of radiation therapy for treating oligodendroglioma after surgical resection have produced promising results using high doses of radiation, However, these doses are close to those that cause necrosis of normal brain, making the accurate spatial localization of tissue at risk for containing tumor cells more important. Because MR imaging is superior to CT in detecting some types of intracranial disease, nine patients with oligodendroglioma were studied with both MR and CT, Results were compared with surgical findings. In six cases, MR identified some tumor volume found during surgery that was not detected by CT. In addition, the interface between abnormality (tumor plus edema) and normality was depicted much more clearly by MR than by CT in most cases. Such superior depiction of the margins of abnormality is important for radiation therapy planning because of the known tendency of oligodendroglioma to infiltrate adjacent edema, making all areas of abnormality potential tumor-bearing tissue. Finally, MR showed normal brain tissue in areas considered suspicious by CT, because they were not well seen on CT in several patients. In these cases of low-grade oligodendroglioma, MR was believed to be superior to CT in providing information needed for radiation therapy planning because of its ability to distinguish tumor and adjacent edema (considered tissue at risk for containing microscopic tumor) from contiguous normal brain.

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American Journal of Neuroradiology
Vol. 8, Issue 1
1 Jan 1987
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The Utility of MR in Planning the Radiation Therapy of Oligodendroglioma
William P. Shuman, Brian R. Griffin, David R. Haynor, David C. Jones, J. Steve Johnson, Laurence D. Cromwell, George E. Laramore
American Journal of Neuroradiology Jan 1987, 8 (1) 93-98;

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The Utility of MR in Planning the Radiation Therapy of Oligodendroglioma
William P. Shuman, Brian R. Griffin, David R. Haynor, David C. Jones, J. Steve Johnson, Laurence D. Cromwell, George E. Laramore
American Journal of Neuroradiology Jan 1987, 8 (1) 93-98;
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