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Several seizure-like symptoms are difficult to differentiate from epileptic convulsion, and then if they were misdiagnosed, they could be led to grave prognosis. A 41-year-old man was referred to the emergency room due to unconsciousness. Brain computed tomography (CT) revealed acute subdural hemorrhage along the left frontal lobe, and intraparenchymal hemorrhage in the left temporo-occipital lobe. After emergent decompressive craniectomy, he recovered an alert mental state but became progressively drowsy. Four days later, virtually continuous tonic upward eyeball deviation was observed. He had been taking antiepileptic drugs following an occipital lobectomy 20 years prior due to intractable epilepsy, and we assumed these upward eyeball deviations were symptoms of non-convulsive occipital lobe status epilepticus. Hence, doses and classes of antiepileptic drugs were modified, but clinical manifestations did not improve. Follow-up brain CT revealed newly developed hydrocephalus and compression of the mesencephalon. His symptoms fully resolved after a ventriculo-peritoneal shunt operation. In this case report, we describe the case of a patient exhibiting tonic upward eyeball deviation induced by hydrocephalus that was not associated with a seizure.

Tonic Upward Eyeball Deviation Mimicking Non-Convulsive Occipital Lobe Status Epilepticus That Was Induced by Hydrocephalus