Legend Axial T2 and FLAIR images show a hyperintense mass extending from the pons to the right cerebellum. The mass expands the pons and right middle cerebellar peduncle, and deforms the fourth ventricle. A basilar flow void is present.

Legend Left: Axial T1 weighted image shows the mass with predominately low T1 signal. Right: Sagittal and axial post-contrast T1 images show rim contrast enhancement of the mass with irregular internal margins and is relatively little central enhancement. Key words: mri tumor neoplasia brainstem

Brain Diagnosis: Brain stem glioma