A large intramedullary neurofbroma in the thoracic spinal cord: Case report

Abstract

Neurofbromas are occasionally present in spinal roots; however, an intramedullary neurofbroma is especially rare. Although a few cases of intramedullary neurofbromas in cervical spinal cord have been reported, to the best of our knowledge, there are no reports of intramedullary neurofbromas in thoracic spinal cord, and moreover, no reports have clearly reported immunohistochemical fndings. We report a rare case of a large intramedullary neurofbroma in the thoracic spinal cord and show immunohis-tochemical examination of the tumor. A 52-year-old man presented with a 2-year history of progressive gait disturbance. Neurological examinations demonstrated complete motor and sensory defcit of his legs. Magnetic resonance imaging of the thoracic spine demonstrated an intramedullary enhancing mass within the spinal cord between T4 and T5 levels. The patient underwent T3–T6 laminectomy surgery. The dura mater was opened to reveal fusiform dilatation of the spinal cord and a midline myelotomy was performed. An intramedullary mass was revealed and could be resected totally. Histopathological examination revealed that the tumor cells exhibited spindle-shaped and wavy nuclei with abundant collagen, which resembled schwannoma or fbrous meningioma. By immunohistochemical examination, some tumor cells were positive for S-100 proteins; however, most tumor cells were strongly positive for CD34. From these pathological fndings and immunohistochemical reactions, we diagnosed the intramed-ullary tumor as a neurofbroma.