Fig. 2.

MRI examinations at t = 0 and week 2 showing the migratory lesions of mitochondrial encephalomyopathy, lactic acidosis, and stroke-like episodes (MELAS). At t = 0, there is cortical diffusion weighted imaging (arrowhead) and FLAIR hyperintensity with isointense signal on the ADC map. This lesion shows partial resolution with new lesions in the temporal lobe, both anterior and posterior, to the original lesion with extension into occipital cortex (arrows) on the week 2 MRI.