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Midbrain pilocytic astrocytoma in a 20-year-old woman. A sagittal T2-weighted image (a) shows exophytic growth of the tumour. An axial, post-contrast, T1-weighted (b) image shows intense contrast enhancement (arrows). On proton MRS with TE 144 ms (c, d), "pseudomalignant" spectrum is observed with an elevated choline peak and reduction of the NAA peak, choline/Cr ratio (3.17), and NAA/Cr ratio (2.55)
