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. This report describes the case of a 35-year-old woman with progressive back pain with loss of sensation and power of both lower limbs. Magnetic resonance imaging showed an intramedullary unifocal space-occupying lesion in her thoracolumbar spinal cord. Subtotal resection and subsequent histopathological and immunohistochemical studies confirmed the diagnosis of gliosarcoma of the spinal cord. This report further establishes the clinical entity of primary spinal gliosarcoma and proposes the need to consider this possibility among the differential diagnoses of a space-occupying spinal lesion.