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Mammography and other mammary gland examinations

Mammography is an X-ray examination used to examine a palpable lump or other symptoms in the breast.

For women aged 35 and older, mammography is the primary imaging method for examining the mammary gland. An ultrasound examination of the breast may also be performed as a complementary examination alongside mammography.  

For women under 35, a breast ultrasound is performed first, followed by consideration of further examinations if necessary. If suspicious changes are detected, a tissue sample is always taken during imaging under local anesthesia. 

In some cases, mammary gland MRI (magnetic resonance imaging) is also performed. 

Mammography is also used for breast cancer screening in asymptomatic women. You can read more about screening on the website of the Ministry of Social Affairs and Health. The aim of screening is to detect breast cancer as early as possible, when the prognosis for treatment is good. 

Women aged 50–69 are invited to breast cancer screening by personal letter every 20–26 months based on population registry data. The screening result is sent by personal letter. If further examinations are needed based on the screening, you will receive an invitation to them and possibly to subsequent procedures and treatments. 

 If you have questions about the schedule or invitation for your own screening, contact the health services of your municipality of residence. 

No special preparation is needed for mammography. You may eat, drink, and take your medications normally before the examination. 

If you know or suspect that you are pregnant, inform your treating physician or mention it when you arrive for the examination. 

Mammography is performed using a specially designed X-ray imaging device. The breast being examined is compressed between two plates to keep it still, enhance the visibility of details, and reduce radiation exposure. 

The compression may feel uncomfortable but lasts only for the moment the image is taken. Images may be taken from several angles. 

Watch the video: What is mammography and what happens during the examination? The video is produced by HUS and includes subtitles in Finnish, Swedish, and English. 

Watch the video: What happens during breast MRI and how to prepare for the examination? The video is produced by OYS and includes subtitles in Finnish and Swedish. 

Mammography does not require follow-up and does not restrict normal daily activities. If a tissue sample is taken, you will receive post-procedure care instructions if needed. 

A radiologist examines the images and provides a report. The physician who referred you for the examination will inform you of the results and discuss further treatment. Contact your care unit if you do not have a scheduled appointment or call time. 

The result of a screening examination will be sent to your home by letter. 

Mammography uses X-rays, but the radiation risk is minimal. 

If you have concerns about radiation, you can always ask for more information from your treating physician or the staff at the imaging unit. 

Updated 7.11.2025