Brain Radiation Shrinks Small Memory Areas Over a Year
Original title: Volumetric Changes in Hippocampal Subfields and Memory Performance After Fractionated Brain Radiation Therapy.
How far along is this research?
- Lab cells
- Animals
- Review
- Tested in people
This was tested in people. That is the most reliable kind of research we share.
This study watched people after radiation. It did not test a new treatment.
The short version
After brain radiation, small memory areas of the brain got smaller over the first year.
What was studied. Eighty-nine adults with brain tumors got radiation in many small doses. They had brain scans and memory tests before radiation, then at 3, 6, and 12 months.
What they found. Many small parts of the hippocampus, a memory area of the brain, got smaller at 3, 6, and 12 months. Parts that got more radiation tended to shrink more. Eight parts on the right side and one part on the left shrank more with higher doses at every check. People with larger memory areas did better on memory tests.
What this means, and what it doesn't
What it could mean: How much radiation reaches these small memory areas may matter. Doctors might plan radiation to spare them. The study authors think that could help protect memory.
What it doesn't mean: This does not mean radiation always harms your memory. This study only watched what happened to people after their treatment. It did not test a new treatment, and it is not a cure. Sparing these small parts is an idea for future planning. It is not proven care you can ask for today.
Source: PubMed, August 27, 2026 · Read the original
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