Cerebellar astrocytomas: therapeutic management.

Area of Science:

• Neurosurgery
• Oncology
• Radiology

Background:

• Cerebellar astrocytomas are primarily managed surgically.
• Non-surgical or incomplete tumor removal often leads to recurrence and poorer outcomes.
• The cerebellum's compensatory capacity supports radical surgical approaches.

Purpose of the Study:

• To evaluate the efficacy of surgical management for cerebellar astrocytomas.
• To determine the impact of total versus subtotal tumor excision on recurrence rates and survival.
• To highlight the role of radiological imaging in diagnosis and follow-up.

Main Methods:

• Retrospective analysis of patients with cerebellar astrocytomas.
• Surgical intervention including total excision, subtotal resection, biopsy, and decompression.
• Serial computed tomography (CT) scans for radiological work-up and follow-up.

Main Results:

• Total excision achieved in 41% of patients, with 95% recurrence-free for 25+ years.
• Subtotal resection in 40% of patients; only 35% recurrence-free at 5 years, but prolonged survival observed in two-thirds.
• Biopsy/decompression alone resulted in rapid recurrence, with <30% recurrence-free at 5 years.
• Operative mortality varies (5% for unilateral tumors, up to 30% for vermis tumors).
• Radiotherapy did not improve recurrence rates or survival in subtotal removal cases.

Conclusions:

• Total surgical excision is the preferred treatment for cerebellar astrocytomas to achieve long-term recurrence-free survival.
• Subtotal resection, despite higher recurrence risk, can lead to prolonged survival due to unpredictable tumor behavior.
• Long-term radiological follow-up is crucial due to the unpredictable nature of cerebellar astrocytomas, even after total removal.