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Brain tumors and epileptic spasms: Natural history and outcomes.
Epilepsy & Behavior : E&B 2017 October
While brain tumors are a frequent cause of seizures, they rarely cause epileptic spasms (ES). The objective of this study was to investigate features of tumor-associated ES. We conducted a retrospective review of patients with ES and a brain tumor. Demographics; pathologic, radiologic, and EEG data; treatment response; and long-term outcome were collected. Twenty four patients were identified; 11 met inclusion criteria. Epileptic spasm (ES) onset occurred prior to tumor diagnosis in seven patients (63%), and after tumor resection in 4 patients (36%). Spasms and ictal EEG often had focal features (45%). Gross total tumor resection resulted in ES freedom in 3/7 patients. There was poor response to first-line therapy (ACTH/vigabatrin; 1/5 with ES freedom). Low grade tumors predominated (8/11) with dual pathology (associated cortical malformation) in 2 patients. All tumors involved cortex; half involved subcortical regions and/or brainstem. Ten patients developed other seizure types; eight experienced refractory epilepsy, and nine had a Modified Rankin Scale of >3. In summary, EEG in tumor-associated ES often has focal features of either the semiology or EEG. Complete tumor resection yielded ES freedom in only a subset of patients. Most patients developed refractory epilepsy and adverse developmental outcomes.
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