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FIG 1. Case 1. Axial postcontrast CT image (A) and coronal postcontrast T1-weighted image (B) (480/20/1 [TR/TE/excitations]) show a non-enhancing lesion within both sides of the genu (curved arrow) of the corpus callosum with mass effect on the frontal horns. Axial T2-weighted image (C) (2500/105/1) shows corresponding high signal intensity within the genu of the corpus callosum (curved arrow), crossing the midline. An old infarct is noted within the right posterior border zone and scattered foci of T2 signal abnormality are seen in the left frontal and parietal regions. A biopsy of the lesion was obtained, confirming an infarct
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