Spinal Extradural Arachnoid Cyst
A 59-year-old man presented with both leg radiating pain and paresthesia for 4 years. Other physical findings were not remarkable. MRI showed a large, elongated posterior extradural cyst from T12 to L3 with surrounding bony erosion ().\nThinned overlying laminas were found on operative field and the cyst was ruptured during laminectomy. There was a hole-like dural defect near to right L1 root sleeve and we performed primary closure of the defect. Some part of cyst wall was also removed.\nThe patient's symptoms were gradually subsided and follow up image taken 1 month after the operation showed complete disappearance of the cyst ().