An MRI sign may help tell radiation damage from a returning tumor
Original title: Imaging MRI biomarkers for diagnosing brain radionecrosis: focus on incomplete ring enhancement sign.
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 was a look back at scans from real patients, and the authors say it is still an early proof of concept.
The short version
A broken ring shape on an MRI scan may help doctors tell radiation damage apart from a tumor that has come back.
What was studied. Doctors looked back at scans from people treated with focused radiation for brain metastases between 2015 and 2022. Out of 1,179 treated metastases, they found 45 cases of radiation damage. They reviewed 90 MRI scans in all: the 45 with radiation damage, and 45 matched tumors from the same patients that had not yet been treated.
What they found. The incomplete ring sign picked out 97% of the radiation damage cases. It correctly ruled out 76% of the untreated tumors. A broken up, fragmented look was seen in 89% of radiation damage cases and in only 2% of the tumors. Small satellite spots were seen in 29% versus 2%.
What this means, and what it doesn't
What it could mean: If your MRI shows this sign after radiation, it may point to radiation damage rather than a tumor that is growing again. Telling those two apart is hard, and it changes what happens next. The doctors reading the scans usually agreed with each other about whether the sign was there. This is a way of reading a scan, not a new treatment.
What it doesn't mean: This is not a treatment, and it is not a cure. The study authors call it a proof of concept, which means it is an early idea that still needs to be tested properly. The scans were compared against tumors that had never been treated with radiation. They were not compared against tumors that came back after radiation, and that is the real question doctors face. The study also looked back at old records at one hospital. No single scan sign can tell for sure what is going on in your brain.
Source: PubMed, July 25, 2026 · Read the original
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