Differentiation of brain abscesses from necrotic glioblastomas and cystic metastatic brain tumors with diffusion tensor imaging
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Updated: May 30, 2026
Diffusion Tensor Magnetic Resonance Imaging in the Analysis of Neurodegenerative Diseases
Published on: July 28, 2013
1Department of Medical Imaging and Intervention, Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Tao-Yuan, Taiwan.
Background And Purpose:
The differentiation of abscesses from glioblastomas and metastases may not always be possible on the basis of DWI. Our hypothesis was that differences in diffusion properties as detected by DTI allow differentiation of abscess from glioblastomas and metastasis. Furthermore, diagnostic performance of tensor metrics quantifying anisotropy or tensor shapes is better than that of ADC in measuring mean diffusivity for this purpose.
Materials And Methods:
DTI was performed in 15 abscesses, 15 necrotic glioblastomas, and 26 cystic metastases. In each lesion, manually segmented into 4 regions of interest (ie, cystic cavity, enhancing rim, and immediate [edema most adjacent to the enhancing rim] and distant zones of edema), FA, ADC, C(l), C(p), and C(s) values were measured and statistically compared among groups and evaluated with ROC curve analysis. The presence of a hyperintense FA rim (a rim of edematous tissue that was hyperintense on the FA map) was assessed visually.
Results:
Abscess was significantly different from glioblastoma for all tensor metrics measured in the cystic cavity and immediate zone of edema and for all except C(l) in the enhancing rim. Abscess was significantly different from metastasis for all tensor metrics measured in the cystic cavity and enhancing rim and for FA, ADC, and C(l) in immediate zone of edema. The incidence of a hyperintense FA rim was significantly higher in glioblastoma and metastasis compared with abscess. The 3 tensor metrics with the highest performance in differentiating abscess from glioblastoma and metastasis were FA, C(l), and C(s) of the cystic cavity.
Conclusions:
DTI is able to differentiate abscess from glioblastoma and metastasis. FA, C(l), and C(s) outperformed ADC in diagnostic performance comparisons.
Insights
Diffusion tensor imaging (DTI) can differentiate brain abscesses from glioblastomas and metastases. Specific tensor metrics like fractional anisotropy (FA) and C(l), C(s) in the cystic cavity show superior diagnostic performance over ADC measurements.
Area of Science:
- Neuroimaging
- Radiology
- Diffusion Tensor Imaging
Background:
- Distinguishing brain abscesses from glioblastomas and metastases using conventional diffusion-weighted imaging (DWI) can be challenging.
- Advanced diffusion imaging techniques may offer improved diagnostic capabilities.
Purpose of the Study:
- To investigate the utility of diffusion tensor imaging (DTI) in differentiating brain abscesses from glioblastomas and metastases.
- To compare the diagnostic performance of various DTI tensor metrics against apparent diffusion coefficient (ADC) measurements.
Main Methods:
- DTI was performed on 15 abscesses, 15 necrotic glioblastomas, and 26 cystic metastases.
- Regions of interest included cystic cavity, enhancing rim, and edema zones.
- Fractional anisotropy (FA), ADC, C(l), C(p), and C(s) values were measured and analyzed using ROC curve analysis.
Main Results:
- Significant differences in tensor metrics were observed between abscesses and glioblastomas/metastases across various lesion regions.
- A hyperintense FA rim was more prevalent in glioblastomas and metastases than in abscesses.
- FA, C(l), and C(s) of the cystic cavity demonstrated the highest diagnostic performance.
Conclusions:
- DTI effectively differentiates brain abscesses from glioblastomas and metastases.
- Tensor metrics (FA, C(l), C(s)) offer superior diagnostic performance compared to ADC for this differentiation.
