Malignant transformation in pediatric spinal intramedullary tumors: case-based update

Area of Science:

• Pediatric neuro-oncology
• Spinal cord tumor research
• Cancer biology

Background:

• Intramedullary spinal cord neoplasms in children are uncommon, typically presenting as low-grade neuroepithelial tumors like astrocytomas and ependymomas.
• Malignant transformation is frequently observed in recurrent adult low-grade gliomas but is exceptionally rare in pediatric low-grade intramedullary spinal cord tumors.

Observation:

• This report details two pediatric cases of low-grade neuroepithelial tumors (a WHO grade I ganglioglioma and a low-grade astrocytoma) located in the intramedullary spinal cord.
• Both patients underwent surgical treatment and histological diagnosis, with subsequent tumor progression to higher grades observed during follow-up.
• Crucially, these transformations occurred spontaneously, without prior exposure to radiation or chemotherapy, and in the absence of any known genetic predisposition to cancer.

Findings:

• Malignant transformation can occur in pediatric low-grade intramedullary spinal cord neoplasms.
• This represents a novel documented event for pediatric intramedullary spinal cord tumors and a rare occurrence for pediatric low-grade neuroepithelial tumors when not induced by irradiation.
• Existing literature shows a paucity of studies on malignant transformation in pediatric central nervous system (CNS) tumors compared to adult counterparts.

Implications:

• Further research into the molecular mechanisms underlying pediatric low-grade neoplasms is warranted.
• Identifying specific molecular pathways may help uncover more aggressive tumor subtypes prone to malignant degeneration.
• This understanding could lead to improved diagnostic and therapeutic strategies for pediatric spinal cord tumors.