Posterior Reversible Encephalopathy syndrome (PRES) is a rare neurologic disorder characterised by vasogenic edema in occipital and parietal lobes on MR. Patients usually complain about headache, visual disturbance, seizure and altered mental status. We repot a case of PRES seen in a pregnant patient. Although pre-eclampsia and eclampsia are among the common causes of this syndrome in this case patient was normotensive and no proteinuria was present. To our knowledge this is the first PRES case presented of a pregnant patient without eclampsia or pre-eclampsia.