Benign breast lumps: fibroadenoma, cysts and other causes

Why do breast lumps form?

Breast tissue is made of glands, ducts, fat and connective tissue that respond to hormones throughout the menstrual cycle, pregnancy and the menopause. These changes can create lumps, lumpiness or fluid-filled cysts. Benign breast lumps are especially common between the ages of 20 and 50. Breast cancer becomes more likely with age, so a lump in an older woman always needs particularly careful assessment – see breast cancer symptoms.

Fibroadenoma

A fibroadenoma is a smooth, firm, rubbery lump that moves easily under the fingers – sometimes called a "breast mouse". It is most common in young women. Most fibroadenomas stay the same size or shrink over time and do not increase cancer risk significantly. Once confirmed by ultrasound and, when needed, a core needle biopsy, a small fibroadenoma can simply be monitored. Removal is considered when it is large (often more than about 3 cm), growing, painful or worrying to you.

Breast cysts and fibrocystic changes

Cysts are fluid-filled sacs, most common in the decade before the menopause. They can appear quickly, may be tender and often feel smooth. Ultrasound shows them clearly; a painful cyst can be drained with a fine needle, after which it usually disappears.

Fibrocystic breast changes describe general lumpiness and tenderness, often worse before a period. They are a normal variation, not a disease. Supportive bras and reducing cyclical pain, explained on our breast pain page, usually help.

Other benign lumps

• Lipoma: a soft, slow-growing lump of fatty tissue.
• Intraductal papilloma: a small growth in a milk duct that can cause clear or bloodstained nipple discharge; usually removed for diagnosis.
• Fat necrosis: a firm lump caused by damaged fat, for example after an injury or breast surgery such as reduction or fat transfer.
• Breast abscess: a painful, red infected lump, more common during breastfeeding.
• Phyllodes tumour: an uncommon, usually benign tumour that can grow quickly. Because some are borderline or malignant, it is removed with a margin of healthy tissue.
• Accessory breast tissue: a lump in the armpit can be extra breast tissue – see accessory breast.

How breast lumps are diagnosed

Breast clinics use "triple assessment":

1. Clinical examination by a breast specialist.
2. Imaging: ultrasound (especially under 40) and mammography (usually from 40); sometimes MRI.
3. Biopsy: a core needle biopsy under local anaesthetic, guided by ultrasound, to examine a sample of the tissue.

Results are combined to give a clear diagnosis. If you have implants, tell the team – see mammography with implants.

Understanding your results

Breast imaging reports often use a scoring system from 1 to 5 (in the UK, "U" scores for ultrasound, "M" scores for mammography and "B" scores for biopsy; elsewhere the BI-RADS system is common). In simple terms:

• 1: normal breast tissue;
• 2: a benign finding, such as a simple cyst or a typical fibroadenoma;
• 3: probably benign, but uncertain – usually a biopsy or a short-interval check is recommended;
• 4 and 5: suspicious findings that need a biopsy and specialist review.

A biopsy result such as "fibroadenoma", "fibrocystic change" or "benign breast tissue" is reassuring when it matches the imaging. Some biopsy results – for example atypical hyperplasia or a papilloma – are benign but are sometimes removed to be certain, or followed with closer screening. Ask your breast team to explain your scores and the next step, and keep copies of your reports: they are useful for future screening and for any breast surgery you may plan, such as a lift or augmentation.

After the menopause, new lumps are less likely to be hormonal, so they are investigated with particular care. Men can also develop lumps; most are gynecomastia, but a firm lump should still be checked.

Removing a benign lump

When removal is advisable, the lump is taken out through a small incision, ideally placed at the edge of the areola or in the breast fold so the scar is discreet. It is often done under general anaesthetic as a day case; small lumps may be removed with vacuum-assisted biopsy. The tissue is always sent to the laboratory. Recovery usually takes a few days. If several lumps or a large one leave a contour change, the shape can be corrected with plastic surgery techniques used in a breast lift.

How New City Clinic can help

Please see your local doctor promptly for any new lump. If you already have ultrasound or biopsy results and want a second opinion, or a fibroadenoma has been recommended for removal, New City Clinic can review your reports online. Breast surgeons and the oncology team work in accredited hospitals in Istanbul, and a WhatsApp coordinator organises everything. Contact newcityclinic.com for a free assessment.