Fig. 10

A 25-year-old woman with Susac’s syndrome presenting with vertigo and vertical diplopia. DWI shows restrictive lesions in the centre of the corpus callosum described as ‘snowballs’ (a, b, arrows) and in the posterior limb of internal capsule appearing as a ‘string of pearls’ (c, dotted arrows). Contrast-enhanced FLAIR shows small round white matter lesions (‘snowballs’) in the central fibres of the corpus callosum (d, arrows) and leptomeningeal contrast enhancement predominant in the posterior cranial fossa (d, arrowheads)