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Background  Posterior reversible encephalopathy syndrome (PRES) is a clinical-radiologic entity characterized by headaches, altered mental status, seizures, visual loss, and a characteristic imaging pattern in brain magnetic resonance images. The exact etiology and pathogenesis of this condition are not yet fully elucidated.    Case presentation  A 72-year-old White man presented with 2 weeks of low-grade fever and chills, night sweats, fatigue, dysphagia, and new-onset rapidly increasing cervical lymphadenopathy. He had a history of chronic lymphocytic leukemia with transformation to diffuse large B-cell lymphoma for which he was started on dose-adjusted rituximab, etoposide, prednisone vincristine, cyclophosphamide, and doxorubicin (DA-R-EPOCH). Shortly after treatment initiation, the patient developed severe airway obstruction due to cervical lymphadenopathy that required emergency intubation. A few days later, the cervical lymphadenopathy and the status of the airway improved, and sedation was consequently weaned off to plan for extubation. However, the patient did not recover consciousness and developed generalized refractory seizures. Brain magnetic resonance imaging revealed edema in the cortical gray and subcortical white matter of the bilateral occipital and inferior temporal lobes, consistent with PRES.    Conclusions  Posterior reversible encephalopathy syndrome refers to a neurological disorder and imaging entity characterized by subcortical vasogenic edema in patients who develop acute neurological signs and symptoms of a usually reversible nature in different settings, including chemotherapy. Despite its name, PRES is not always fully reversible, and permanent sequelae can persist in some patients. Clinicians should be aware of the possible association between chemotherapy and PRES to ensure early recognition and timely treatment.

Posterior reversible encephalopathy syndrome in a patient with Richter's syndrome on combination DA-R-EPOCH chemotherapy regimen: a case report