Giant noncommunicating extradural thoracic arach noid cyst in an adult : A case report and review of the literature

Abstract : Noncommunicating spinal extradural arachnoid cysts (NSEAC) are extremely rare spinal lesions, mainly found in adults. They are believed to arise from an arachnoid membrane herniation through a small dural defect and are mostly reported to be located at lower thoracic region and thoracolumbar junction. The pathogenesis of this entity is still unclear. Here, we describe a case of a giant noncommunicating extradural thoracic arachnoid cyst in a 52-year-old man revealing by spinal cord compression. Magnetic resonance imaging is the diagnostic modality of choice. Complete surgical excision is mandatory for symptomatic patients and stays the best therapeutic option.