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Definition Return to top
Fibroadenoma of the breast is a benign (noncancerous) tumor.
Causes Return to top
Fibroadenoma is the most common benign tumor of the breast and the most common breast tumor in women under age 30. Fibroadenomas are usually found as single lumps, but about 10 - 15% of women have several lumps that may affect both breasts.
Black women tend to develop fibroadenomas more often and at an earlier age than white women. The cause of fibroadenoma is not known.
Symptoms Return to top
Lumps may be:
They should have well-defined borders, but they may grow in size, especially during pregnancy. The lumps often get smaller after menopause (if a woman is not taking hormone replacement therapy).
Exams and Tests Return to top
After a careful physical examination, the following tests may be done to determine further information about a breast lump:
Treatment Return to top
A biopsy is needed to get a definite diagnosis. Women in their teens or early 20s may not need a biopsy if the lump goes away on its own.
If a biopsy indicates that the lump is a fibroadenoma, the lump may be left in place or removed, depending on the patient and the lump. If left in place, it may be watched over time with:
The lump may be surgically removed at the time of an open biopsy (this is called an excisional biopsy). The decision depends on the features of the lump and the patient's preferences.
Alternative treatments include removing the lump with a needle and destroying the lump without removing it (such as by freezing, in a process called cryoablation).
Outlook (Prognosis) Return to top
The outlook is excellent, although patients with fibroadenoma have a slightly higher risk of breast cancer later in life. Lumps that are not removed should be checked regularly by physical exams and imaging tests, following the doctor's recommendations.
Possible Complications Return to top
If the lump is left in place and carefully watched, it may need to be removed at a later time if it changes, grows, or doesn't go away.
In very rare cases, the lump may be cancerous and you may need further treatment.
When to Contact a Medical Professional Return to top
Call your health care provider if:
Perform regular breast self-exams and undergo breast screening as recommended by your health care provider.
References Return to top
Valea FA, Katz VL. Breast diseases: diagnosis and treatment of benign and malignant disease. In: Katz VL, Lentz GM, Lobo RA, Gershenson DM, eds. Comprehensive Gynecology. 5th ed. Philadelphia, Pa: Mosby Elsevier; 2007:chap 15.Update Date: 12/31/2008 Updated by: David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine; and Susan Storck, MD, FACOG, Chief, Eastside Department of Obstetrics and Gynecology, Group Health Cooperative of Puget Sound, Redmond, Washington; Clinical Teaching Faculty, Department of Obstetrics and Gynecology, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.