Four patients (three males and one female) with spinal cysts underwent surgery between 1986 and 1990. According to the classification described by Goyal et al. in 1987, two patients had extradural arachnoid cysts at Thll-L1, and a perineural cyst at Sl. The other two patients were diagnosed as hairng synovial cysts located at the L4-5 level, and a cyst in the right posterior root at C7. Follow-up studies over an average of 2 years, showed that recovery was achieved in 3 patients. However there

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... as no change in the patient with the extradural arachnoid cyst. Recurrence of cyst was not seen in all patients.* Many spinal cysts are asymptomatic. Surgical intervention should be considered when comfirmatory neurologic deficits caused by cyst are present.