Legend Axial T2 images show heterogeneous signal hyperintensity and mass effect involving the left pons. Note the signal abnormality respects the midline, suggesting a vascular etiology.

Legend Diffusion images (top left B=1000, bottom left ADC map) show left pontine diffusion restriction. MRA (right images) shows a high grade mid basilar artery stenosis with post-stenotic dilatation. Key words: mri dwi mra stroke vascular

Brain Diagnosis Acute pontine infarct & basilar artery stenosis