Hi - As I understand it, breasts identified by a doctor as being clinically dense, and fibrocystic change (fibrocystic breasts), are two different things. Fibrocystic breasts are when your breast tissue grows too much, for whatever reason. This causes your breasts to be denser (less fat, percentage-wise). "Dense breasts" are breasts that are just naturally very fibrous - with very little fat. Unlike fibrocystic change, the tissue doesn't keep over-growing; it's stable, but the relationship of tissue to fat is high. I could be out in left field here - but that's how I understand it. Hope this helps - PJH