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Study: Benign tumors not rare

Thu., Nov. 1, 2007

ATLANTA – One in 60 older people may be walking around with benign brain tumors and don’t know it. Even more may have bulging blood vessels in the head that could burst.

These results come from a surprising new Dutch study that finds brain conditions are not all that uncommon.

It’s not clear how alarming this is. Most of the abnormalities hadn’t caused any symptoms, though some were potentially life-threatening.

But the findings may have implications for patients in the future: As more of these abnormalities are spotted with more sophisticated equipment during routine medical tests, some doctors may urge patients to have surgery or other treatment as a precaution. Or some patients may push doctors to fix the potential problem.

“It’s very scary to learn there’s something wrong in your head,” said Dr. Aad van der Lugt, an associate professor in radiology at Erasmus MC University Medical Center in Rotterdam and a co-author of the study published in today’s New England Journal of Medicine

The study is based on MRI, or magnetic resonance imaging, scans of 2,000 healthy adults with an average age of 63. They were participating in a study to look at the causes and consequences of age-related brain changes. The new paper’s findings were incidental to the main research.

Participants who needed additional evaluation or treatment were referred to specialists. None of the brain tumors spotted by the MRIs required surgery, the researchers said.

The Dutch scientists found that 145 people – or 7.2 percent – had some dead brain tissue caused by a loss of blood flow. These are sometimes called silent strokes and usually don’t result in a loss of speech or motion.

However, a patient who’s had a silent stroke may be more likely to have another, more serious stroke, said Dr. Greg Joseph, a Charlotte, N.C., neuroradiologist who is part of a doctors group that reads 100 brain scans a day.

An additional 32 people in the study – or 1.6 percent – had brain tumors. All but one were noncancerous, but even benign tumors can kill if they grow and shut down vital brain functions. Doctors sometimes treat these, or do annual MRI scans to watch for signs of growth.

An additional 35 people – or 1.8 percent – had bulging blood vessels, called aneurysms. Blood vessels that burst can cause serious strokes. However, all but five aneurysms found in the study were small and not considered dangerous.

The Dutch participants were mostly white, middle class and healthy; whether the same brain abnormalities would be found in other groups of people isn’t known, the researchers said.

In brain scans to investigate headaches or other problems, it’s not unusual to find a small percentage of unexpected abnormalities. But the new study – one of the largest of its kind which used a state-of-the-art MRI scanner – gives perhaps the best estimate of how often these occur in the general public, said Judy Illes, a University of British Columbia professor who has written extensively on the topic.


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