[Treatment of symptomatic convexity arachnoid cyst in the elderly by neuroendoscope assisted-stereotactic surgery: a case report].

A 70-year-old female had Gerstman syndrome and a mild right side hemiparesis. She had no history of head injury. MRI revealed a large left convexity arachnoid cyst. Stereotactic cyst-ventricular shunting assisted by neuroendoscope was performed under local anesthesia. The postoperative course was uneventful. CT scan, performed one week after operation, showed a size reduction of the cyst. Her preoperative clinical signs progressively improved. Symptomatic arachnoid cyst in the elderly is rare. This paper discussed their findings in the previous published papers and the effectiveness of neuroendoscope assisted stereotactic fenestration of the cyst.