Fibrocystic disease occurs when there are fluid-filled cystic lumps of duct tissue. These lumps are surrounded by a scar-like capsule of tissue in the breasts.
Although harmless, these lumps can sometimes be the site of pain (mastalgia) that recurs late in each menstrual cycle. The greatest problem with fibrocystic disease is telling the difference between this condition and breast cancer.
The glandular tissue of the breasts cycles monthly with menstrual periods. It enlarges to prepare for a pregnancy, and then shrinks if one does not occur. This cycling causes cysts and excess fibrous tissue to build up. Virtually all women will have some form of this condition during their reproductive years. However, most women will not seek treatment.
Your doctor will ask about your symptoms and medical history. A physical exam will be done.
Tests may include the following:
Once it has been determined that the lump is not a cancer, it can be left alone. If the lump's identity is still in doubt, it should be biopsied.
After numbing the area with a local anesthetic, a small needle is inserted into the lump. This is to draw fluid out. If the lump disappears, cancer is highly unlikely. If the lump remains, or if the fluid withdrawn is bloody, it will need to be examined to see if cancer is present.
There are two types of biopsies:
Once cancer has been ruled out, fibrocystic disease may be safely treated with observation and conservative measures, including:
American Cancer Society
Office on Women's Health
Canadian Breast Cancer Foundation
Canadian Women's Health Network
A healthy pregnancy for women with diabetes. American Congress of Obstetricians and Gynecologists website. Available at: http://www.acog.org/~/media/For%20Patients/faq176.pdf?dmc=1&ts=20130726T0945559945. Accessed July 26, 2013.
Miltenburg DM, Speights VO Jr. Benign breast disease. Obstet Gynecol Clin North Am. 2008;35(2):285-300.
Phyllodes tumor of breast. EBSCO DynaMed website. Available at: http://www.ebscohost.com/dynamed. Updated August 1, 2012. Accessed July 26, 2013.
Last reviewed May 2015 by Andrea Chisholm
Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition.