(HealthDayNews) -- Magnetic resonance imaging (MRI) helps radiologists identify
breast tumors missed by mammography, says a study presented Dec. 1 at the
Radiological Society of North America annual meeting in Chicago.
The international study, the first of its kind to compare MRI and mammography
in women with a genetically high risk for breast cancer, was conducted at 13
sites and included 367 women over age 25 with at least a 25 percent risk of
breast cancer.
"We want to find a screening modality that can improve detection in high-risk
young women, including those with dense breast tissue," study presenter Dr.
Constance Dobbins, an assistant professor and director of breast imaging at the
University of Washington Medical Center in Seattle, said in a prepared
statement.
Each of the women in the study had MRI, mammography and a clinical breast
exam. The study found that MRI had a 1.1 percent diagnostic yield, compared with
a 0.3 percent diagnostic yield for mammography.
That means that MRI would detect 11 cancers in 1,000 high-risk women, while
mammography would detect three cancers in 1,000 high-risk women.
"MR findings resulted in 6 percent of women with a negative mammogram and a
negative clinical breast exam being recommended for biopsy. Three additional
cancers were detected in those women," Dobbins said.
More information:
The U.S. National Cancer Institute has more about breast cancer screening
(www.cancer.gov ).
