Background: A 45-year-old woman with small-cell lung cancer presented to a hospital emergency department in an acute confusional state, with blurred vision and mild headache. Following progressively increasing lethargy, she subsequently became unresponsive to tactile and verbal stimuli. She had recently been started on chemotherapy with carboplatin and gemcitabine.

Methods: Physical examination, imaging studies including brain MRI, noncontrast brain CT scans and magnetic resonance angiography, continuous EEG monitoring, and cerebrospinal fluid analysis. Methods: Posterior reversible leukoencephalopathy syndrome (PRES) related to chemotherapy, and nonconvulsive status epilepticus related to PRES.

Results: Withholding of chemotherapeutic agents, and antiseizure therapy for the status epilepticus.