Fig 1.

Images in a 50-year-old woman with biopsy-proven tumefactive demyelinating lesion.

A, Contrast-enhanced axial T1-weighted image (600/14/1) demonstrates an ill-defined enhancing mass (arrow) in the left frontoparietal periventricular white matter.

B, Axial T2-weighted image (3400/119/1) shows increased signal intensity (arrow) around the lesion.

C, Localizing image (600/14/1) for proton MR spectroscopy displays a voxel in the central portion of the lesion.

D, Proton MR spectrum obtained by using PRESS (1500/144) demonstrates an elevated Cho value, a decreased NAA value, and a Lac doublet.