Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Examples of mammograms exhibiting different distributions of fatty and dense tissue. a The dense tissue is mainly located on the lower part of the breast. b The bulk of the dense tissue is concentrated in the retroareolar area. c The dense tissue is scattered but falls into two clusters, one next to the nipple and the other in the upper part of the breast
