I am waiting for the results of my mammogram and ultrasound. I found a large immovable lump in my right breast. The ultrasound showed a large dark oval circle but of course no one is answering my questions. I have swollen lymph nodes in right arm, neck, and chest. Pain in my back and arm, and have body aches allover as well as night sweats. No breast changes or discharge other than the lump. I am 41 years old with no family history of breast cancer. I had my first of two children at age 25 and started menses at age 12. What are the chances this is just a benign cyst? What about cancer?