Sagittal midline T1-weighted (A) and coronal fluid-attenuated (B) inversion recovery (C) images demonstrate evidence of progressive cerebellar atrophy when compared with interval sagittal T1-weighted midline image. Sagittal midline T1-weighted (A) and coronal fluid-attenuated (B) inversion recovery (C) images demonstrate evidence of progressive cerebellar atrophy when compared with interval sagittal T1-weighted midline image. Note evidence of pontine involvement with T1-weighted hypointensity returned from a pons diminished in size. Fernando Scaglia et al. AJNR Am J Neuroradiol 2005;26:1675-1680 ©2005 by American Society of Neuroradiology