Primary intramedullary spinal gliosarcoma: An unusual presentation.

Gliosarcoma is a biphasic central nervous system malignancy composed of glial and mesenchymal components. It is recognized as a rare variant of glioblastoma with unique histology, immunostaining properties, and natural history. Although usually described to primarily involve the brain, a search of the published literature revealed four reported cases of gliosarcoma arising in the spinal cord.