Original imaging had demonstrated a large enhancing mass lesion in in the left hemisphere more than the right, crossing the midline, with enhancing mass lesions extending along the corticospinal track into the midbrain. Over time, this area has become quiescent, the enhancement having largely resolved, leaving an extensive area of encephalomalacia, and with volume loss along the signal abnormality in the left corticospinal tract. On the current examination, there remains extensive cerebral atrophy, ventriculomegaly and dilated sulci. The very extensive left hemispheric encephalomalacia (involving the left frontal parietal and occipital lobes) with resulting wallerian degeneration related atrophy of the midbrain and pons are again demonstrated. No new findings are seen in the cerebellar hemispheres. No abnormal contrast enhancement. No evidence of interval activity. Stable disease appearance.