Primary Epidural Peripheral Primitive Neuroectodermal Tumor of the Lumbar Spine: A Case Report

nant, small, round cell tumor that occurs mostly in children or young adults. The most common localization of PNETs is the cerebellum, and is also known as a medulloblastoma. PNETs may also arise in the cerebrum, brainstem, pineal gland, spinal cord, and peripheral nerves (1). Primary spinal PNETs are rare and only 32 cases have been reported in the literature (2-5). Primary spinal PNETs can arise as intramedullary, extramedullary, or extradural tumors at any level of the spinal cord. Most primary spinal PNETs are intramedullary and only 8 patients have been reported to have primary spinal PNETs in an epidural location. Here we present an extremely rare case of a primary peripheral PNET confined to the epidural space of the lumbar spine with imaging and immunopathologic findings.