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The study included nearly 2,000 people, average age 78, who visited a memory clinic in the Netherlands. Brain CT scans showed more than 19 percent of them had abnormal calcium buildups (calcifications) in the brain's hippocampus. That part of the brain plays an important role in short- and long-term memory.
But the researchers added that there was no link between the presence and severity of hippocampal calcifications and cognitive function, which they called "a surprising finding."
"The hippocampus is made up of different layers, and it is possible that the calcifications did not damage the hippocampal structure that is important for memory storage," study lead author Dr. Esther J.M. de Brouwer said in a journal news release. "Another explanation could be the selection of our study participants, who all came from a memory clinic."
"We know that calcifications in the hippocampus are common, especially with increasing age," said de Brouwer, a geriatrician at University Medical Center in Utrecht. "However, we did not know if calcifications in the hippocampus related to cognitive function.
"We do think that smoking and diabetes are risk factors," de Brouwer added. "In a recent histopathology study, hippocampal calcifications were found to be a manifestation of vascular disease. It is well-known that smoking and diabetes are risk factors for cardiovascular disease. It is, therefore, likely that smoking and diabetes are risk factors for hippocampal calcifications."
The researchers plan further studies to learn more about possible links between these calcifications and mental decline.
-- Robert Preidt
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SOURCE: Radiology, news release, June 12, 2018