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. 2014 May 2;5(3):387–402. doi: 10.1007/s13244-014-0328-2

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© The Author(s) 2014

Open Access This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided the original author(s) and the source are credited.

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Fig. 9 — Focal midbrain glioma, a histopathologically proven pilocytic astrocytoma in an 11-year-old boy. Sagittal (a) and axial (b) T2-weighted images show an exophytic, sharply marginated, hyperintense mass involving the right cerebral peduncle. No surrounding oedema is identified. On this T1-weighted image (c), the mass is isointense compared with grey matter. The mass is isointense on diffusion-weighted imaging (d). An axial post-contrast image (e) shows heterogeneous enhancement of the tumour. Proton MRS with TE 144-ms (f, g) revealed high choline/Cr (2.46) and NAA/Cr ratios (1.27)