Two Surgery Routes for Insular Brain Tumors Compared
Original title: Transcortical versus Transsylvian Approach for Insular Gliomas: A Systematic Review and Meta-Analysis.
How far along is this research?
- Lab cells
- Animals
- Review
- Tested in people
This looks across many earlier studies rather than running a new one.
Both of these surgeries are already done today, but this is a look back at past cases, not a study that tested one route against the other.
The short version
Surgeons can reach these deep tumors two different ways, and one way removed more tumor with fewer problems afterward.
What was studied. Researchers pulled together sixteen past studies covering 1,517 patients who had surgery for an insular glioma: A tumor that starts in the glial cells, the support cells of the brain and spinal cord. Gliomas are graded 1 to 4 by how fast they tend to grow. See the glossary, a tumor deep in the side of the brain. They compared two routes surgeons use to reach it: through the surface of the brain, or through a natural groove between brain lobes. About half the tumors were slower growing and about half were faster growing, and the most common first symptom was a first seizure (62.8%).
What they found. Going through the surface of the brain removed all of the tumor the surgeon could see more often than going through the groove. The groove route more often left some tumor behind. Speech problems and movement problems right after surgery were also more common with the groove route.
What this means, and what it doesn't
What it could mean: If you are facing surgery for an insular glioma: A tumor that starts in the glial cells, the support cells of the brain and spinal cord. Gliomas are graded 1 to 4 by how fast they tend to grow. See the glossary, the route your surgeon takes may matter. It is fair to ask which route they plan to use and why. The best choice still depends on where your tumor sits and how far it has spread.
What it doesn't mean: This does not mean one route is always better for every person. Nobody was assigned to a route on purpose here. Researchers just added up results from surgeries that already happened, in different hospitals with different surgeons. That makes the numbers rough, not proof. Surgery is not a cure for a glioma: A tumor that starts in the glial cells, the support cells of the brain and spinal cord. Gliomas are graded 1 to 4 by how fast they tend to grow. See the glossary, and neither route is a promise of one. Your surgeon still has to judge what is safest for your tumor.
Source: PubMed, February 3, 2026 · Read the original
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