Children's Hospital of Los Angeles - Neurology, Los Angeles, California 90027-6016, USA
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A 15-year-old boy with Hashimoto's thyroiditis presented with a paroxysmal episode. The EEG demonstrated prominent superior and lateral rectus muscle artefacts, superimposed on a normal background. Since seizures are known to occur in patients with thyroiditis, correct interpretation of the interictal EEG was very important. Initially, the frontal discharges may have been mistaken for epileptiform [...]