An 83-year-old woman was presented to ED with a 5-hour history of weakness in the left arm, dropping on the right side of the face, slurred speech, and urinary incontinence. Additionally, a 7-week history of cognitive and functional decline was reported. A gadolinium-enhanced MRI of the head was acquired (attached image). T1-weighted sequence: Panel A T2-weighted sequence: Panel B What can be the differential diagnosis of the lesion that extends across the corpus callosum and into the frontal lobes?
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