Hamartoma

What it is

A hamartoma is a benign, meaning not harmful, growth that is like a small, disorganized island of normal breast tissue. It is an overgrowth of the fat, fibrous tissue, and glandular tissue that naturally make up your breast. Because they contain a mix of normal tissues, they are sometimes called a 'breast within a breast'.

How common it is

Hamartomas are uncommon. However, they do make up a small percentage of benign breast lumps that are found and checked by a provider.

What you may notice

You might feel a soft, movable, and usually painless lump. Often, hamartomas do not cause any symptoms at all and are found by chance during a routine mammogram.

What can contribute

The exact cause of hamartomas is not known. They seem to develop on their own and are not linked to any specific lifestyle factors or habits.

How it is usually checked

Your provider will likely start with a clinical breast exam. To get a clear look at the area, they may suggest imaging like a mammogram or an ultrasound. Sometimes, a biopsy is needed to confirm that the lump is a hamartoma and not something else.

Does this change my long-term risk?

Having a hamartoma does not change your long-term breast health risk. These growths are benign and are not known to become a more serious problem.

Comfort and everyday care

• Knowing your normal can help you notice changes. Consider getting familiar with how your breasts usually look and feel.
• Some women find that eating a balanced diet rich in fruits, vegetables, and whole grains supports their overall wellness.
• Gentle, regular movement that you enjoy is a great way to support your overall health.

These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.