SPINAL EXTRADURAL MENINGEAL CYST - CASE-REPORT

The case of a 30-year-old man with a spinal extradural meningeal cyst in the thoracolumbar region is reported. Operative findings revealed a dural defect that allowed communication between the extradural cyst c avity and the subarachnoid space. Application of the Valsalva maneuver made the cerebrospinal fluid flow into the cyst cavity; however, reve rse flow did not occur. These findings indicate that a valvelike mecha nism developed in the enlarging cyst. Surgical resection of the cyst w all and closure of the dural defect provided a favorable result.