Legend Axial T2 and FLAIR images show a hyperintense mass centered on the midbrain on the left. The lesion shows local mass effect upon the temporal horn. The lesion also involves the left optic tract, lateral geniculate ganglion, and proximal optic radiations.

Legend T1W Coronal pre (upper left) and Coronal and Axial post (center and right) Gadolinium images show mass effect, but no significant enhancement. Key words: mri tumor neoplasia

Brain Diagnosis: Anaplastic astrocytoma