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Transient Postictal MRI Changes in Patients with Brain Tumors may Mimic Disease Progression
Surg Neurol 67:246-250, Finn, M.A.,et al, 2007
See this aricle in Pubmed

Article Abstract
Imaging shortly after an ictal event can potentially mislead the clinician to interpret changes as tumor or pathologic progression. Unnecessary intervention in these patients with new and suspicious imaging findings should be avoided. We recommend repeat imaging be performed in patients with brain tumors and seizures several weeks after seizure control if clinically feasible. Further research is needed to delineate the time course of seizure-induced MRI changes.
 
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