By Liz Szabo, USA TODAY

Screening women with both ultrasounds and mammograms allows doctors to find more breast cancers than if they rely on mammograms alone, a new study shows. However, the combination also leads to many more unnecessary biopsies, and experts don't recommend it to most patients.

Researchers involved in a study of more than 2,600 women in today's Journal of the American Medical Association focused on women at high risk, such as those who have had previous breast tumors.

By Amanda Gardner
EmpowHer's HealthDay Reporter

MONDAY, Feb. 25 (HealthDay News) -- Women who take combined hormone therapy for about five years have a higher risk of abnormal mammograms and breast biopsies.

This, in turn, may decrease the effectiveness of these methods of detecting breast cancer, according to a new study published in the Feb. 25 issue of Archives of Internal Medicine.