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Crossed Cerebellar Diaschisis Related to Recurrent Focal Seizures

Summary: After several days of recurrent focal motor seizures in a 32‐year‐old pregnant woman, a brain magnetic resonance imaging (MRI) scan showed signal abnormalities restricted to cerebral cortex and contralateral cerebellum that did not enhance after gadolinium administration. Maximal EEG dysfunction and seizure onset correlated anatomically with the area of image change. An aggressive medication regimen and termination of the pregnancy resulted in seizure control, reversal of postictal neurologic deficit, and improvement or resolution of the MRI and EEG abnormalities in 6 weeks. We concluded that the sequence of events suggested the reversible MRI lesions to be the result of repetitive seizure activity and that both localization and resolution of the lesions may be explained by reversible excitotoxic cell damage due to seizure‐related excessive synaptic discharge.