Here are the current screening recommendations for women at high risk for hereditary breast cancer in the U.S. the U.K. and France. All 3 sets of guidelines are based on expert opinion only, because to date there is no evidence that any screening regimen reduces breast cancer mortality in the high risk population. Note that the only thing these guidelines have in common is a recommendation for annual mammography starting at an early age.

NICE = National Institute for Clinical Excellence
NCCN = National Comprehensive Cancer Network