Re: breast cancer
Ultrasound
Ultrasound of the breast is often done to evaluate a breast lump.
Ultrasound waves create a "picture" of the inside of the breast.
It can demonstrate whether a mass is filled with fluid (cystic) or solid. Cancers are usually solid, while many cysts are benign.
Ultrasound might also be used to guide a biopsy or the removal of fluid.