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Figure 1: Magnetic resonance imaging and magnetic resonance angiography (Brain) of case 1, with refractory epilepsy, showing normal, axial, T1-weighted (a), T2-weighted (b) and fluid attenuated inversion recovery (c) images with increased signal intensity of the entire splenium of corpus callosum ("Boomerang sign") on diffusion-weighted image (d); repeat diffusion-weighted image (e), done at 6 months, showing complete resolution of abnormal signals involving the splenium. Magnetic resonance angiogram (f) did not reveal any abnormality

Figure 1: Magnetic resonance imaging and magnetic resonance angiography (Brain) of case 1, with refractory epilepsy, showing normal, axial, T1-weighted (a), T2-weighted (b) and fluid attenuated inversion recovery (c) images with increased signal intensity of the entire splenium of corpus callosum (