In this report, we present a rare case of an arachnoid cyst (AC) of the right frontal convexity in a 18year-old girl. She presented with a 13-year history of right-sided hemifacial spasm associated with progressive headache during last two months. Her past history revealed that she had not benefited from the drug treatment administered for anxiety disorder. Therefore, surgical drainage via burr-hole trephination was performed and then control examination revealed complete disappearance of her complaints, inspite of partial recurrence of the AC. Here, we present a rare case of convexity AC that caused headache and anxiety disorder and was treated with surgical drainage via burr-hole trephination.
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