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British Journal of Radiology (2005) 78, 533-537
© 2005 British Institute of Radiology
doi: 10.1259/bjr/68749637
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Differentiation between solitary brain metastasis and high-grade glioma by diffusion tensor imaging

K Tsuchiya, MD A Fujikawa, MD M Nakajima, MD and K Honya, MD

Department of Radiology, Kyorin University School of Medicine, 6-20-2, Shinkawa, Mitaka, Tokyo 181-8611, Japan



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  		Figure 1. (a) Fractional anisotropy (FA) map shows regions of interest (ROIs) placed in an enhancing part and a surrounding region in a patient with metastatic adenocarcinoma. This image is identical to Figure 2cGo. (b) FA map shows two ROIs placed similarly in Figure 1aGo in a patient with glioblastoma. This image is identical to Figure 3cGo.

 


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  		Figure 2. A 60-year-old woman with surgically confirmed adenocarcinoma of unknown origin (brain metastasis case 6). (a) Axial fluid attenuated inversion recovery (FLAIR) image (8000/120/2300/1 [repetition time/echo time/inversion time/number of excitations (TR/TE/TI/NEX)]) shows a hyperintense mass with cystic component surrounded by moderate degree of oedema. (b) Axial post-contrast T1 weighted image (540/15/1.4 [TR/TE/NEX]) shows enhancement of the solid part as well as that of the cyst wall. (c) Fractional anisotropy (FA) map shows lower FA of the solid part (*, 0.08) than that of the peritumoural oedematous part (0.18). Displaced white-matter fibres are also visible (arrow).

 


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  		Figure 3. A 47-year-old woman with pre-treatment glioblastoma (high-grade glioma case 6). (a) Axial T2 weighted image (4240/105/1 [repetition time/echo time/number of excitations (TR/TE/NEX)] shows a heterogeneously hyperintense mass surrounded by a hyperintense region. (b) Post-contrast T1 weighted image (540/15/1.4 [TR/TE/NEX]) shows enhancement of the solid part. (c) Fractional anisotropy (FA) map shows diffuse hypointensity due to decreased FA. The enhancing part (0.2) and non-enhancing part (0.15) are hard to discriminate.

 




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