Non communicating extra dural meningeal cyst in dorsal spine

Spinal extradural meningeal cyst has been rarely reported, whose etiologies are assumed to be the communication of cerebrospinal fluid (CSF) between intradural subarachnoid space and cyst due to the congenital defect in dura mater. Although the CSF communication due to this defect can be found in most case, few cases in which there is a lack of the communication have also been reported. We report a case of extradural meningeal cyst occurring in the dorsal spine (D7 and D8) where there was a lack of the communication between the intradural subarachnoid space and cyst in a 15-yearold male who presented with symptoms of gait disturbance and right leg pain. The patient underwent laminectomy and cyst excision. On intraoperative findings, the dura was intact and there was a lack of the communication with intradural subarachnoid space. Immediately after the surgery, leg pain and gait disturbance improved