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How common is a dilated aortic root?

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A dilated aortic root is fairly common, according to the National Center for Biotechnology Information. The incidences of this type of aneurysm are about 4.5 per 100,000 people. Patients tend to be between 30 and 50 years old, and men and women are equally affected.

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Medical professionals sometimes don't know what causes a dilated aortic root, though many cases are linked to conditions such as Ehler-Danlos syndrome or Marfan syndrome, claims the National Center for Biotechnology Information. These two conditions are inherited, says Mayo Clinic.

A dilated aortic root is also associated with a deformity known as bicuspid valve, says Cleveland Clinic. Other risk factors for a dilated aortic root are infection by salmonella, staphylococcus and streptococcus bacteria.

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