FIG 1. Control case.

A, Axial T2-weighted MR image shows the single 2 x 2 x 2-cm voxel (box) localized in frontal lobe white matter from which the proton spectrum was acquired.

B, MR spectrum shows that the Cho and Cr peaks are roughly equal in height, and the N-acetylaspartate (NAA) peak is approximately 1.6 times the height of the Cr peak.