Ultrasound of benign fibroadenoma. Unlike a cyst, a fibroadenoma (solid benign tumor of the breast) has internal echoes or dots on ultrasound. Unfortunately, ultrasound is not 100% accurate in telling a fibroadenoma from breast cancer, so a biopsy may be necessary.

Note: Images are shown for illustrative purposes. Do not attempt to draw conclusions or make diagnoses by comparing these images to other medical images, particularly your own. Only qualified physicians should interpret images; the radiologist is the physician expert trained in medical imaging.