Left parietooccipital abscess
There is approximately 1.5 x 1.1 x 2.0 cm cystic lesion located within the mesial subcortical white matter of the posterior left occipitoparietal lobe. Cystic area demonstrates restricted diffusion. There is avid ring enhancement as well as marked surrounding white matter edema extending approximately to the posterior horn of the left ventricle. There is no significant mass effect or sulcal effacement. No other areas of abnormal enhancement identified. There are no other brain lesions.