Large intra-axial mass/collection with peripheral enhancement in the left frontal and parietal lobe, involving the left basal ganglia, with areas of calcification in the medial aspect. Perilesional vasogenic edema involving the frontal, parietal, and temporal lobes, crossing the midline in the frontal region. There is compression of the left lateral ventricle and effacement of the third ventricle. There is midline shift and resultant right ventricular hydrocephalus. Edema extends to the upper part of the brainstem.