Breast ultrasonography is a non-invasive, radiation-free medical imaging technique that uses high-frequency sound waves to visualize the internal structures of the breast. It is primarily used as a diagnostic tool to evaluate specific areas of concern, such as palpable lumps or abnormalities detected during a screening mammogram.

The procedure relies on a handheld device called a transducer, which emits sound waves into the breast tissue. These waves bounce off different internal structures, creating echoes that a computer translates into real-time, cross-sectional grayscale images.

A primary benefit of breast ultrasound is its superior ability to differentiate between solid masses and fluid-filled cysts, a distinction that mammography alone cannot always make accurately. It is also highly effective for scanning individuals with dense breast tissue, pregnant women, and younger patients. During a biopsy, clinicians frequently use real-time ultrasound guidance to precisely locate a lesion and extract tissue samples.

While ultrasound is an invaluable diagnostic tool, it is generally utilized as a supplemental imaging method rather than a standalone screening tool, as it cannot reliably detect microcalcifications, which are often early signs of breast cancer.