neuraxis dissemination
The spread of brain tumors along cerebrospinal fluid pathways throughout the central nervous system, including brain and spinal cord.
Full Definition
Neuraxis dissemination refers to the metastatic spread of primary brain tumors through cerebrospinal fluid pathways to distant sites within the central nervous system, including the brain and spinal cord. This pattern of spread is particularly common in certain pediatric brain tumors such as medulloepitheliomas, primitive neuroectodermal tumors, and some high-grade gliomas. The tumor cells travel through CSF circulation and can implant at various locations along the neuraxis, creating multiple lesions. Detection of neuraxis dissemination typically requires contrast-enhanced MRI of the entire brain and spine, and its presence significantly impacts staging, prognosis, and treatment planning, often necessitating craniospinal radiation therapy.
Usage
Usage note: Preferred term over 'CSF seeding' in formal documentation; critical for staging decisions.
In Context
- "Staging MRI revealed neuraxis dissemination with multiple enhancing nodules along the spinal cord surface." — Staging workup report
- "The presence of neuraxis dissemination upgraded the tumor staging and necessitated craniospinal irradiation." — Treatment planning note