An Uncommon Cause of Posterior Reversible Encephalopathy Syndrome Related to Antibiotic Ingestion.

Posterior reversible encephalopathy syndrome (PRES) is a neurotoxic state manifested with a unique computed tomography (CT) or magnetic resonance imaging (MRI) appearance. PRES is associated with different conditions, such as eclampsia, sepsis, organ transplantation, and drugs, especially immunosuppressive medications. Besides pharmacologic side effects, antibiotics can cause PRES as well. Here, we report a 37-year-old female from Saudi Arabia, presenting to the emergency department (ED) with a two-day history of fluctuations in consciousness level, headache, and blurring of vision. A generalized vesicular skin rash preceded the condition for one month; this was diagnosed as chicken pox and the patient received co-amoxiclav for a possible superadded bacterial infection. Besides clinical manifestations, the patient had radiological abnormalities, which were resolved following the withdrawal of causative antibiotics. Ascertaining the exact etiological cause of PRES is essential for diagnosing this reversible condition as these patients undergo a complete neurological recovery if the underlying cause is identified early.