Causes of New-Onset Seizures and Their Treatment in Children With Non-CNS Malignancies: A Retrospective Study in a Tertiary Care Center

Background: Seizures occur in up to 13% of children with non-central nervous system (CNS) malig-nancies, but little is known about their causes and optimal diagnostic and therapeutic approaches. Here we sought to determine etiologies and clinical trajectories of new-onset seizures in this patient population. Methods: A retrospective chart review over a 10-year period was conducted at the American University of Beirut Medical Center to identify children with non-CNS malignancies and at least one new-onset seizure. Data were collected on the underlying malignancy, seizure etiology, clinical course, treat-ments, electroencephalograms, and brain imaging. Results: New-onset seizures occurred in 56 children (2-year median follow-up), most commonly in the context of acute lymphoblastic leukemia, lymphomas, and sarcomas. In 19 children, the first seizure consisted of status epilepticus. The most common etiologies were cerebrovascular accidents, posterior reversible encephalopathy syndrome, and metastasis. Forty-nine patients received anti-seizure medi-cations (ASMs). Withdrawal of ASMs was successful in 19 children with normal initial or follow-up brain imaging but failed in three patients with persistent brain lesions. The remaining children, all of whom except two had structural brain abnormalities, received chronic ASMs and remained seizure free for a median period of 2 years at the last follow-up in survivors. Conclusions: Not only are seizures in children with non-CNS cancers often indicative of a serious brain insult, but they can also be challenging in the form of status epilepticus. An urgent diagnostic evaluation is therefore needed to expedite treatment, which should be tailored to the chronicity of the underlying cause. (c) 2022 Elsevier Inc. All rights reserved.