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Lymphocytic vasculitis, MR spectroscopy.
A, 2 × 2 × 2 cm single voxel spectroscopy performed over a right high parietal enhancing lesion.
B, Spectrum obtained with a PRESS sequence using a short echo time of 30 ms shows slight elevation of the choline peak (Cho, 3.2 ppm) compared with the creatine peak (Cr, 3.0 ppm), marked elevation of the glutamate and glutamine peaks (Glx, 2.1–2.5 ppm), and marked elevation of the lipid peak (Lipid, 0.9–1.5 ppm). NAA, n-acetylaspartate (2.0 ppm).
