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Figure 4: Magnetic resonance imaging (Brain) of case 4, with post-infectious parkinsonism, showing hyperintense signals in bilateral substantia nigra on axial T2-weighted image (a), more pronounced on left side; T1-weighted (b) and T2-weighted (c) images, axial section, focussing on the corpus callosum appear normal while a uniform hyperintensity of the splenium of corpus callosum ("Boomerang sign") on diffusion-weighted image (d) is evident. Repeat diffusion-weighted image (e), done after 10 days, depicting reversibility of lesion involving the splenium of corpus callosum; the hyperintense signals involving the substantia nigra on axial T2-weighted image (f) decreased in size

Figure 4: Magnetic resonance imaging (Brain) of case 4, with post-infectious parkinsonism, showing hyperintense signals in bilateral substantia nigra on axial T2-weighted image (a), more pronounced on left side; T1-weighted (b) and T2-weighted (c) images, axial section, focussing on the corpus callosum appear normal while a uniform hyperintensity of the splenium of corpus callosum (