Granular Cell Tumor

What it is

A granular cell tumor is a type of growth made of cells that look grainy, or granular, under a microscope. These tumors can appear in many places in the body, including the breast. They grow from nerve cells, not from the breast tissue itself.

How common it is

These are uncommon, making up less than one percent of all breast lumps. They can happen at any age but are most often found in women in their 40s and 50s.

What you may notice

You might feel a single, firm lump that does not usually cause pain. Sometimes, the skin over the lump may look thicker or slightly dimpled.

What can contribute

The exact cause of granular cell tumors is not known. They are not thought to be caused by anything you did or did not do.

How it is usually checked

If you have a lump, your provider will likely start with a physical exam and imaging like a mammogram or ultrasound. Because these growths can look like other kinds of breast changes, a biopsy is often needed to know for sure what it is. A biopsy is when a small sample of tissue is removed to be looked at in a lab.

Does this change my long-term risk?

The great majority of granular cell tumors are completely harmless and do not change your long-term breast health risk. In very rare cases, the cells can have more concerning features, which is why your provider will want to identify them correctly.

Comfort and everyday care

• Wearing a soft, supportive bra that fits well can help ease any discomfort from a lump.
• Some women find that gentle stretching and staying active helps with general body and breast wellness.
• Keeping a simple log of any changes you notice can be helpful to share with your provider at your appointment.

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.