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Surgery of cerebellar astrocytomas, ependymomas and medulloblastomas in children
Insights
Improved surgical techniques for pediatric brain tumors, specifically cerebellar astrocytoma, ependymoma, and medulloblastoma, have significantly reduced surgical mortality. Advances in diagnosis and surgical procedures led to a notable decrease in operative deaths for these challenging pediatric brain tumors.
Area of Science:
- Pediatric Neurosurgery
- Neuro-oncology
- Surgical Outcomes
Background:
- Cerebellar astrocytoma, ependymoma, and medulloblastoma are common pediatric brain tumors.
- Surgical management of these tumors has evolved significantly over time.
- Early diagnostic methods and surgical approaches had higher associated risks.
Purpose of the Study:
- To evaluate the impact of evolving diagnostic and surgical techniques on mortality rates in children with cerebellar astrocytoma, ependymoma, and medulloblastoma.
- To compare surgical outcomes between two distinct periods with differing medical technologies and protocols.
- To assess the long-term prognosis for different types of pediatric posterior fossa tumors.
Main Methods:
- Retrospective analysis of 118 pediatric patients operated on for cerebellar astrocytoma, ependymoma, or medulloblastoma between 1968 and 1982.
- Comparison of outcomes between two surgical periods: 1968-1975 (ventriculography, same-day surgery) and 1976-1982 (CT scans, preoperative shunting, delayed surgery, operating microscope).
- Assessment of surgical mortality, shunt management, and long-term survival rates.
Main Results:
- Surgical mortality decreased from 5% (astrocytoma), 22% (ependymoma), and 16% (medulloblastoma) in the earlier period to 0% in the later period.
- The introduction of CT scans, preoperative shunting, delayed posterior fossa operations, and operating microscopes correlated with the absence of surgical mortality.
- Excellent 10-year survival (97%) for astrocytoma; poorer outcomes for medulloblastoma (5-year survival 27%, 10-year survival 13%) and ependymoma (poor prognosis regardless of therapy).
Conclusions:
- Modern diagnostic tools and surgical advancements, including preoperative shunting and the use of operating microscopes, have dramatically improved surgical safety for pediatric posterior fossa tumors.
- While astrocytomas show excellent prognosis, medulloblastomas and particularly ependymomas continue to present significant long-term challenges.
- Continuous refinement of treatment strategies is crucial for improving outcomes in pediatric neuro-oncology.
Abstract:
A report is given on 118 children operated on for cerebellar astrocytoma, ependymoma or medulloblastoma in 1968-1982. During the first period (1968-1975) when the diagnosis was based on ventriculography and the operation performed later on the same day, the surgical mortality was 5%, 22%, and 16% respectively in these tumours. In the period since 1976, during which the diagnosis was based on CT and preoperative shunting was routine with the posterior fossa operation performed a week later and an operation microscope was available, no surgical mortality occurred. In patients with ependymoma or medulloblastoma the shunt was left in permanently; in patients with astrocytoma the shunt was removed if the patient tolerated its closure. The prognosis for astrocytoma was excellent. The 10-year survival rate was 97%. The five-year survival rate for medulloblastoma was 27% and the 10-year survival rate 13% which are less than the rates generally reported. For ependymoma patients the prognosis was poor whatever the therapy.