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Abstract

Differentiating recurrent tumor from radiation necrosis: time for re-evaluation of positron emission tomography?

P E Ricci, J P Karis, J E Heiserman, E K Fram, A N Bice and B P Drayer
American Journal of Neuroradiology March 1998, 19 (3) 407-413;
P E Ricci
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J P Karis
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J E Heiserman
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E K Fram
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A N Bice
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B P Drayer
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Abstract

UNLABELLED Our purpose was to evaluate the ability of FDG PET to differentiate recurrent tumor from posttherapy radiation necrosis.

METHODS MR images, PET scans, and medical records of 84 consecutive patients with a history of a treated intracranial neoplasm were evaluated retrospectively. In all patients, recurrent tumor or radiation necrosis was suggested by clinical or MR findings. Metabolic activity of the PET abnormality was compared qualitatively with normal contralateral gray and white matter.

RESULTS PET findings were confirmed histologically in 31 patients. With contralateral white matter as the standard of comparison, the PET scan sensitivity and specificity were found to be 86% and 22%, respectively. With contralateral gray matter as the reference standard, the sensitivity and specificity became 73% and 56%, respectively. Overall, nearly one third of the patients would have been treated inappropriately in either scheme had the PET scan been the sole determinant of therapy.

CONCLUSION Our data suggest that the ability of FDG PET to differentiate recurrent tumor from radiation necrosis is limited. Both false-positive and false-negative PET scan results contributed to unacceptably low sensitivity and specificity values.

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American Journal of Neuroradiology
Vol. 19, Issue 3
1 Mar 1998
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Cite this article
P E Ricci, J P Karis, J E Heiserman, E K Fram, A N Bice, B P Drayer
Differentiating recurrent tumor from radiation necrosis: time for re-evaluation of positron emission tomography?
American Journal of Neuroradiology Mar 1998, 19 (3) 407-413;

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Differentiating recurrent tumor from radiation necrosis: time for re-evaluation of positron emission tomography?
P E Ricci, J P Karis, J E Heiserman, E K Fram, A N Bice, B P Drayer
American Journal of Neuroradiology Mar 1998, 19 (3) 407-413;
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  • PET and SPECT for Detection of Tumor Progression in Irradiated Low-Grade Astrocytoma: A Receiver-Operating-Characteristic Analysis
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