They occur most often during the reproductive years. They usually have a rubbery feel, are fairly movable within the breast tissue, and may feel more prominent over a rib. They are not tender and usually do not become malignant. Most often, there is fibrocystic change as well. In some cases fibroadenomas can show changes that are suggestive of increased risk of breast cancer in the future.
Cysts are the other extreme of fibrocystic changes.
These are fluid-filled lumps that often feel like soft grapes. These can sometimes be tender, especially just before the menstrual period begins. Cysts can often be drained in the doctor's office under local anesthesia with a needle. The fluid removed is sent for laboratory studies. If the lab reports that the sample is benign or not cancerous then it is likely the cyst will disappear completely after it is drained and no further treatment will be needed.