Related Experiment Video
Updated: Jan 17, 2026
In Vivo Tracking of Edema Development and Microvascular Pathology in a Model of Experimental Cerebral Malaria Using Magnetic Resonance Imaging
Published on: June 8, 2017
Differentiation between Nonenhancing Tumor in Glioblastoma and Vasogenic Edema Using Diffusion-Weighted and Dynamic
Sahar Alizada1, Yasmin Aly2, Hongbo Bao2
1From the Department of Neuroradiology (S.A.), The University of Texas MD Anderson Cancer Center, Houston, Texas.
Background And Purpose:
Differentiating nonenhancing glioblastoma from vasogenic edema remains a challenge in neuroimaging. This study evaluates the utility of diffusion-weighted and dynamic susceptibility contrast MR imaging, particularly ADC and relative CBV (rCBV), in distinguishing these entities.
Materials And Methods:
We retrospectively analyzed 111 patients diagnosed with glioblastoma with available pretreatment MRIs from January 1, 2022, to December 31, 2023, including 13 patients with 15 solid, nonenhancing glioblastoma lesions and 98 patients with perilesional nonenhancing T2-FLAIR hyperintensity surrounding enhancing glioblastomas. Their ADC and rCBV values were compared with those of 30 brain metastatic lesions age- and sex-matched to solid, nonenhancing glioblastoma lesions. Receiver operating characteristic analysis was performed to determine optimal ADC and rCBV thresholds for classification.
Results:
Solid, nonenhancing glioblastomas had significantly lower mean ADC values and higher mean rCBV values compared with vasogenic edema (1.08 [SD, 0.22] × 10-3 versus 1.74 [SD, 0.17] × 10-3 mm2/s and 2.4 [SD, 0.86] versus 0.30 [SD, 0.13], respectively; P < .001). The optimal ADC and rCBV cutoffs for differentiating solid, nonenhancing glioblastoma from vasogenic edema were 1.36 × 10-3 mm2/s and 1.04, achieving excellent sensitivity (0.93-1) and specificity (1). Perilesional nonenhancing T2-FLAIR hyperintensity around enhancing glioblastomas had ADC values similar to those of vasogenic edema (1.67 [SD, 0.33] × 10-3 versus 1.74 [SD, 0.17] × 10-3 mm2/s; P = .32) but significantly higher rCBV (0.60 [SD, 0.61] versus 0.30 [SD, 0.13]; P = .03). An rCBV cutoff value of 0.42 distinguished perilesional tumor infiltration from pure vasogenic edema with 86% specificity.
Conclusions:
Diffusion- and perfusion-weighted MR imaging, particularly ADC and rCBV measurements, provide valuable biomarkers for differentiating nonenhancing glioblastoma from vasogenic edema. The identified threshold values may enhance glioblastoma characterization, improve preoperative differentiation from metastases, and support more precise, image-guided clinical management.
Insights
Diffusion and perfusion MRI, using apparent diffusion coefficient (ADC) and relative cerebral blood volume (rCBV), effectively differentiate nonenhancing glioblastoma from vasogenic edema. These advanced imaging techniques offer improved diagnostic accuracy for brain tumor characterization.
Area of Science:
- Neuroimaging
- Radiology
- Oncology
Background:
- Differentiating nonenhancing glioblastoma from vasogenic edema is a significant challenge in neuroimaging.
- Accurate distinction is crucial for effective treatment planning and patient management.
Purpose of the Study:
- To evaluate the utility of diffusion-weighted imaging (DWI) and dynamic susceptibility contrast (DSC) MRI, specifically apparent diffusion coefficient (ADC) and relative cerebral blood volume (rCBV) values.
- To distinguish between nonenhancing glioblastoma and vasogenic edema using these quantitative MRI parameters.
Main Methods:
- Retrospective analysis of 111 patients with glioblastoma and available pretreatment MRIs.
- Comparison of ADC and rCBV values between solid nonenhancing glioblastomas, perilesional nonenhancing T2-FLAIR hyperintensity, and vasogenic edema.
- Receiver operating characteristic (ROC) analysis to determine optimal thresholds for classification.
Main Results:
- Solid nonenhancing glioblastomas showed significantly lower ADC and higher rCBV compared to vasogenic edema (P < .001).
- Optimal ADC and rCBV thresholds achieved excellent sensitivity and specificity for differentiating solid nonenhancing glioblastoma from vasogenic edema.
- Perilesional nonenhancing T2-FLAIR hyperintensity had ADC values similar to vasogenic edema but significantly higher rCBV (P = .03).
Conclusions:
- Diffusion- and perfusion-weighted MRI parameters (ADC and rCBV) are valuable biomarkers for differentiating nonenhancing glioblastoma from vasogenic edema.
- Identified threshold values can enhance glioblastoma characterization and preoperative differentiation from metastases.
- These findings support more precise, image-guided clinical management of brain tumors.
Related Concept Videos
01:17Assessment of Diffusion and Perfusion
The Role of Diffusion in Respiration
Diffusion is the process by which molecules move from an area of higher concentration to an area of lower concentration. In the respiratory system, this...
01:24Magnetic Resonance Imaging