Breasts are considered dense in two of the four categories: “heterogeneously dense” or “extremely dense.” The other two categories are considered not dense. Dr. Brian Dontchos of the Seattle-based Fred Hutchinson Cancer Center said the classification can vary depending on the doctor reading the mammogram "because it’s somewhat subjective.” Two reasons: For one, dense breasts make it more difficult to see cancer on an X-ray image, which is what a mammogram is. “The dense tissue looks white on a mammogram and cancer also looks white on a mammogram,” said Dr. Wendie Berg of the University of Pittsburgh School of Medicine and chief scientific adviser to DenseBreast-info.org. “It’s like trying to see a snowball in a blizzard.” Second, women with dense breast tissue are at a slightly higher risk of developing breast cancer because cancers are more likely to arise in glandular and fibrous tissue. Reassuringly, women with dense breasts are no more likely to die from breast cancer compared to other women.
Carla Johnson, ‘Dense breasts can make it harder to spot cancer on a mammogram’, ABC News

















