Spinal cord astrocytomas: presentation, management and outcome

Area of Science:

• Neuro-oncology
• Neurosurgery
• Pediatric Oncology

Background:

• Intramedullary spinal cord astrocytomas are uncommon, representing the most frequent spinal cord tumor in children and the second most common in adults.
• Low-grade histology is predominant, with high-grade lesions accounting for 10-15% in pediatric and a slightly higher proportion in adult cases.
• Symptoms often develop over months to years, with regional back pain as a common initial complaint, while malignant tumors cause rapid neurological decline.

Purpose of the Study:

• To review the characteristics, diagnosis, surgical management, and outcomes of intramedullary spinal cord astrocytomas.
• To highlight the diagnostic utility of MRI and the challenges in achieving complete tumor resection.
• To compare outcomes between low-grade and high-grade astrocytomas and contrast them with ependymomas.

Main Methods:

• Review of existing literature on intramedullary spinal cord astrocytomas.
• Discussion of diagnostic imaging, particularly MRI findings (T1 iso- to hypointense, T2 hyperintense, cystic changes, enhancement patterns).
• Description of surgical techniques including the use of operating microscopes, bipolar cautery, evoked potential monitoring, and surgical adjuncts, with laminectomy in adults and laminoplasty in pediatric patients.

Main Results:

• MRI is the preferred diagnostic tool, showing characteristic signal intensities and enhancement patterns that differentiate astrocytomas from ependymomas.
• Surgical goals focus on tissue diagnosis and maximal safe resection, as total resection is often impossible due to the infiltrating nature of astrocytomas.
• Outcomes for low-grade astrocytomas are less favorable than ependymomas regarding recurrence and function, despite prolonged survival for many. Extent of resection does not correlate with recurrence.
• High-grade tumors have an extremely poor prognosis with relentless progression and short median survival (13 months in children, 6 months in adults).

Conclusions:

• Intramedullary spinal cord astrocytomas require careful surgical management with a focus on maximal safe resection and tissue diagnosis.
• Prognosis is significantly influenced by tumor grade, with high-grade lesions associated with dismal outcomes.
• Further research may be needed to improve outcomes for these challenging tumors, particularly high-grade variants.