Case Presentation: Posterior reversible encephalopathy syndrome (PRES) is a neurological disorder characterized by symptoms of encephalopathy and radiographic findings suggestive of vasogenic edema. Although PRES is most often triggered by hypertensive emergencies, sepsis and immunosuppressive medications have also been implicated in its pathogenesis. We present a case of PRES due to lithium toxicity.A 47-year-old female [...]