Final answer:
A breast ultrasound is performed in addition to a mammogram when further evaluation is needed for breast abnormalities detected on the mammogram or when additional imaging is necessary for women with dense breast tissue.
Step-by-step explanation:
A breast ultrasound is performed in addition to a mammogram in specific situations to provide additional information and aid in the diagnosis of breast abnormalities. It is commonly used when an abnormality is detected on a mammogram, such as a suspicious lump or an area of increased density. The ultrasound can help determine if the abnormality is solid or fluid-filled, which can guide further evaluation and treatment.
One example is when a mammogram shows a suspicious mass that is difficult to evaluate. The ultrasound can provide more detailed images and help differentiate between a benign cyst and a potentially cancerous tumor. Additionally, ultrasound is often used to evaluate breast lumps in younger women with denser breast tissue, as they may benefit from additional imaging to improve diagnostic accuracy.
In summary, a breast ultrasound is performed in adjunct to a mammogram when further evaluation is needed for breast abnormalities detected on the mammogram or when additional imaging is necessary for women with dense breast tissue.