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An important message about dense breasts Pink Bun Day 27 September

By Cynthia Daly

How many women know if they have dense breasts? Does knowing matter?

September 27 is World Dense Breast Day and while highlighting its significance in relation to breast cancer, Whitianga Lions Club also see it as a way of raising money towards Project Mammogram where the club aims to purchase a 3D mammogram machine for the Eastern Coromandel region.

Now, back to dense breasts; I have to admit that I knew nothing about them despite having regular mammograms and I’m also wondering why I have never been told about the risks associated with dense breasts during my mammograms.

Dense breasts are normal and common. About 50% of women in their 40s have them; 40% in their 50s and 25% in their 60s.

Women’s breasts are made of fat and glands that make milk, held together by fibrous tissue. The more glands and fibrous tissue compared to fatty tissue that a woman has, the denser her breast tissue.

Mammograms are effective at identifying breast cancers in the majority of cases in three of the four categories of breast denseness. But in about 10% of women who have extremely dense breasts, cancers are more difficult to detect using mammograms as the high amount of fibrous tissue shows up in a mammogram white, the same as a cancerous breast lump. So the cancers can remain hidden and, in some cases, cancers may not be detected until the cancer is larger and more advanced.

Dense breasts also have a higher risk profile for breast cancer. A woman’s risk for breast cancer increases with the level of density in her breasts.

Surely then, every woman having a screening mammogram should have the right to know the density of her breasts. In a number of countries around the world including the United States of America, large provinces of Canada, Western Australia and most recently in South Australia, women will be informed of their breast density category at all screening clinics. The European Society of Breast Imaging also supports the view that European countries should make reporting on breast density mandatory.

In New Zealand, breast density for a breast screening mammogram is only reported on routinely in the private sector.

It’s time for every New Zealand woman having a breast screen to ask, and expect an answer, about her breast density when having a mammogram. If you fall into the category of breast density that increases the risk of cancer not being detected, there are other tests including Contrast Enhanced Mammograms ultrasounds and MRIs or combinations of these that can provide clearer information, earlier detection and better outcomes. Having dense breasts is normal; not knowing your density could mean a later diagnosis of breast cancer with a worse outcome.

What can you do if you want to know your density?

Book a private screening mammogram with a radiology clinic that does mammography and discuss the results with your GP.

If you would like more information, there is a recent webinar on Dense Breasts on the Breast Cancer Foundation website. Formore information on World Dense Breast Day go to

Pink Bun Day

Thanks to our wonderful supporters on the Eastern Coromandel Peninsula, the below stores are celebrating World Dense Breast Bun Day on Wednesday, 27 September by selling pink buns and donating a percentage/or all of their profit to Project Mammogram.

If you support them by buying some buns on Wednesday, 27 September then this will help speed up the process of getting a permanent 3D mammogram machine based in Whitianga making mammography readily accessible to our communities.

You can buy your pink buns from:

Tairua Four Square

Whitianga Countdown

Whitianga Bay Bakery

Matarangi Four Square

Coromandel Four Square.


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