DISCUSSION
PRES refers to a disorder of reversible subcortical vasogenic brain edema in patients with acute neurological symptoms. The pathophysiology is mainly hyperperfusion of the brain as a sequel of hypertension. This is suggested to be associated with hyperpermeability of cerebral blood vessels[1]. The typical MRI finding is the symmetric vasogenic edema in the parietal and occipital lobes. However, up to the 27% of cases occur at the brainstem[2]. It is, therefore, crucial to bear PRES in mind even though the clinical imaging is atypical.