(HealthDay News) – Unruptured cerebral aneurysms (UCAs) seem to be common in the Chinese population with an overall prevalence of 7%, according to a study published in the Oct. 15 issue of the Annals of Internal Medicine.

Ming-Hua Li, MD, PhD, from the Shanghai Jiao Tong University, and colleagues measured the prevalence of UCAs by using three-dimensional time-of-flight magnetic resonance angiography in 4,813 adults (aged 35–75 years) living in two communities chosen at random from two districts in Shanghai.

The researchers found that there were 369 UCAs in 336 participants (130 men and 206 women), while no evidence of UCAs was found in 4,477 participants. Overall, the prevalence of UCAs was 7% (5.5% for men and 8.4% for women). There was a significantly higher overall prevalence of UCAs in women than in men, and in both men and women the prevalence peaked at age 55–64 years. The internal carotid artery was the location for most UCAs (81%), and the maximum diameter was <5mm in 90.2% of UCAs. In women the mean diameter was larger than in men (3.7mm vs. 3.2mm; P<0.009).

“In summary, the overall prevalence of UCAs in Chinese adults aged 35–75 years is 7% and increases with age in both sexes,” the authors write.

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