The study compared 78 people with cerebral venous thrombosis in Germany to 201 healthy people. Researchers found that a variant of the gene called factor XII C46T is more common in people with cerebral venous thrombosis than in healthy people. A total of 16.7 percent of those with cerebral venous thrombosis had the gene variant, compared to 5.5 percent of those without the condition.

The results were the same after adjusting for factors that could affect blood clotting, such as age, gender, smoking, and use of oral contraceptives.

“These results need to be confirmed, but it appears that people with cerebral venous thrombosis should be tested for this gene and should be considered for use of blood thinning medication to prevent future blood clots,” said study author Christoph Lichy, MD, of the University of Heidelberg in Germany.

Other genetic variants have also been linked to cerebral venous thrombosis.

Cerebral venous thrombosis is a rare condition that is the cause of less than one percent of strokes and other cerebrovascular disorders, but it results in death approximately 10 percent of the time.

Symptoms include headaches, seizures, visual problems, and motor and sensory problems. In addition to genetic factors, other factors that can cause cerebral venous thrombosis include head injury, infection, and certain drugs.

Source: American Academy of Neurology