PMC8457979_01
Sagittal views at the level of the corpus callosum during active susac syndrome. (a) T1-weighted. Note. The 6-7 mm T1 hypodensity in the body of the corpus callosum was consistent with a "snowball" lesion (demarcated by an arrow), and T1 linear hypodensity sparing the calloseptal surface of the corpus callosum was consistent with a linear "spoke" or "icicle" lesion (demarcated by an arrow head). (b) Sagittal T2/FLAIR-weighted imaging with gadolinium contrast. Note. The increased T2/FLAIR signal and contrast enhancement in the "snowball" lesion (demarcated by an arrow) were consistent with active susac syndrome.
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FLAIR and contrast enhancement were noted in the genu and body of the corpus callosum sparing the callosal undersurface consistent with "snowball" lesions (Figure 1). Furthermore, multiple small linear lesions extending from the roof of the corpus callosum towards central fibers consistent with linear "spoke" (or "icicle") lesions were noted (Figure 1).
Sagittal T1-weighted slice at the level of the corpus callosum 12 months after treatment initiation. Note. The decreased "snowball" lesion in the body of the corpus callosum (demarcated by arrow) and relative persistence of linear "spoke" or "icicle" lesions (demarcated by an arrow head).
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