A brain wave pattern that looked like a seizure but was not
Original title: Triphasic waves in leptomeningeal metastases and cycling alternating pattern of encephalopathy during sleep.
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 is one patient's story, shared to help doctors read brain tests better.
The short version
A woman's brain test showed a pattern that can be mistaken for a seizure, and sleep helped prove it was not one.
What was studied. Doctors wrote up the story of one patient, a 69-year-old woman. She had breast cancer that spread to the thin layers covering the brain. She grew quiet and hard to wake, so doctors tested her brain waves over time.
What they found. Her first brain wave test showed only mild slowing and no seizure signs. It was done 1 week after two of her cancer drugs were stopped. A test 1 week later showed a near constant wave pattern that can look like a seizure. The pattern went away when she fell asleep, then came back in cycles during sleep. Her blood and body chemistry did not show another cause.
What this means, and what it doesn't
What it could mean: This pattern on a brain test does not always mean a seizure. That matters because seizures are treated with strong medicine. Watching how the pattern changes with sleep can help tell the two apart. A patient who is not having seizures may avoid drugs they do not need.
What it doesn't mean: This is one person's story, not a study of many people. It is not a new treatment and it does not fight cancer. It will not shrink a tumor or stop it from spreading. It is not a cure and it is not a promise of one. This woman's care stayed focused on comfort. The lesson here is for doctors reading brain wave tests, not a change you can ask for.
Source: PubMed, November 3, 2026 · Read the original
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