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Single lesion at CT (A−C) and MR imaging (D) in 3 patients: a hyperattenuated lesion in the frontal lobe on noncontrast CT (A) with marked enhancement at contrast-enhanced CT (B). C, Marked contrast enhancement is seen in a lesion in the corpus callosum. D, Focal lesion has ring enhancement in the left temporal lobe on coronal T1-weighed contrast-enhanced MR imaging.
