However if you do need surgery, procedures include a lumpectomy or excisional biopsy, or a cryoablation. Typically, you would have a clinical breast exam and ultrasound, with or without mammography. Most women with simple cysts go back to routine breast cancer screening. Sometimes, however, adenomas develop into malignancies. Now, a study by Dr. They can be very tiny, or they can be large enough to feel through the skin Can benign breast tumors become cancerous see on an imaging test a grossly evident cyst, or gross cyst. There can also be thickened but harmless areas called pseudo-lumps.