World's Leading Website About Dense Breasts

How a cancer would show in breast density categories on a mammogram

Breasts that are (A) fatty or (B) scattered, are “not dense” breasts. Breasts that are (C) heterogeneously dense or (D) extremely dense, are “dense” breasts.

Dense Breasts: 5 Facts You Should Know

" …the most up-to-date comprehensive website on breast density knowledge."

For Patients

For Providers

Screening Technologies

Insurance/Inform Laws

State Insurance Law, RANZCR Statement, New Study

State Insurance Law A new Massachusetts insurance law requiring no-cost coverage for screening and diagnostic imaging (exemptions apply) will go into effect on 1/1/2026. For more details, see

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Patient Fact Sheet, New Study

Our popular and printable dense breast Patient Fact Sheet, already translated into 25+ languages, is now available in Albanian. We extend our thanks to DBI/Europe Education Supporter Dr. Iris