intramedullary tumor
A tumor arising within the substance of the spinal cord parenchyma, as opposed to extramedullary locations.
Full Definition
An intramedullary tumor is a neoplasm that develops within the actual substance of the spinal cord parenchyma, in contrast to extramedullary tumors that compress the cord from outside. These tumors most commonly include astrocytomas and ependymomas in adults, with a higher proportion of astrocytomas in the pediatric population. Intramedullary tumors typically present with progressive neurological deficits, pain, and sensory disturbances in a pattern related to the affected spinal cord level. Surgical management is challenging due to the need to preserve spinal cord function while achieving tumor resection, often requiring intraoperative monitoring and microsurgical techniques.
Usage
Usage note: Distinguish clearly from extramedullary tumors in anatomical descriptions.
In Context
- "The cervical intramedullary tumor caused progressive quadriparesis over six months." — Clinical presentation
- "Intramedullary tumor resection requires careful preservation of functional white matter tracts." — Surgical technique description