Figure 1.

MRI of the brain. Axial FLAIR image (A) and unenhanced T1-weighted image (B) show a single ovoid-shaped lesion in the left frontal deep white matter, without enhancement on the T1-weighted post-gadolinium acquisition (C). Sagittal FLAIR image shows hyperintense lesions affecting the ependymal surface of the corpus callosum with a marble pattern (D). The so-called Dawson fingers are visible on the sagittal FLAIR image as hyperintense, ovoid lesions perpendicular to the body of the lateral ventricle (E). Corpus callosum and periventricular lesions don’t show enhancement on the T1-weighted post-gadolinium acquisition (F).