Diagnostic Accuracy of Centrally Restricted Diffusion in the Differentiation of Treatment-Related Necrosis from Tumor Recurrence in High-Grade Gliomas

被引:31
|
作者
Zakhari, N. [1 ]
Taccone, M. S. [2 ]
Torres, C. [1 ]
Chakraborty, S. [1 ]
Sinclair, J. [2 ]
Woulfe, J. [3 ]
Jansen, G. H. [3 ]
Nguyen, T. B. [1 ]
机构
[1] Univ Ottawa, Dept Radiol, Ottawa Hosp, Div Neuroradiol, Civ & Gen Campus,1053 Carling Ave, Ottawa, ON K1Y 4E9, Canada
[2] Univ Ottawa, Div Neurosurg, Ottawa Hosp, Civ Campus, Ottawa, ON, Canada
[3] Univ Ottawa, Dept Pathol & Lab Med, Ottawa Hosp, Civ Campus, Ottawa, ON, Canada
关键词
RADIATION NECROSIS; TRUE PROGRESSION; BRAIN; PSEUDOPROGRESSION; COEFFICIENT; MRI; GLIOBLASTOMA; SPECTROSCOPY; BEVACIZUMAB; CHALLENGES;
D O I
10.3174/ajnr.A5485
中图分类号
R74 [神经病学与精神病学];
学科分类号
摘要
BACKGROUND AND PURPOSE: Centrally restricted diffusion has been demonstrated in recurrent high-grade gliomas treated with bevacizumab. Our purpose was to assess the accuracy of centrally restricted diffusion in the diagnosis of radiation necrosis in high-grade gliomas not treated with bevacizumab. MATERIALS AND METHODS: In this prospective study, we enrolled patients with high-grade gliomas who developed a new ringenhancing necrotic lesion and who underwent re-resection. The presence of a centrally restricted diffusion within the ring-enhancing lesion was assessed visually on diffusion trace images and by ADC measurements on 3T preoperative diffusion tensor examination. The percentage of tumor recurrence and radiation necrosis in each surgical specimen was defined histopathologically. The association between centrally restricted diffusion and radiation necrosis was assessed using the Fisher exact test. Differences in ADC and the ADC ratio between the groups were assessed via the Mann-Whitney U test, and receiver operating characteristic curve analysis was performed. RESULTS: Seventeen patients had re-resecte dring-enhancing lesions: 8 cases of radiation necrosis and 9 cases of tumor recurrence. There was significant association between centrally restricted diffusion by visual assessment and radiation necrosis (P =.015) with a sensitivity of 75% and a specificity of 88.9%, a positive predictive value 85.7%, and a negative predictive value of 80% for the diagnosis of radiation necrosis. There was a statistically significant difference in the ADC and ADC ratio between radiation necrosis and tumor recurrence (P =.027). CONCLUSIONS: The presence of centrally restricted diffusion in a new ring-enhancing lesion might indicate radiation necrosis rather than tumor recurrence in high-grade gliomas previously treated with standard chemoradiation without bevacizumab.
引用
收藏
页码:260 / 264
页数:5
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