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Breast Sonography – Breast Ultrasound Explained

Breast sonography is a non-invasive imaging technique that uses ultrasound waves to examine breast tissue. It is radiation-free, painless, and helps detect changes in the breast at an early stage.

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Things worth knowing about "Breast Sonography"

Breast sonography is a non-invasive imaging technique that uses ultrasound waves to examine breast tissue. It is radiation-free, painless, and helps detect changes in the breast at an early stage.

What is Breast Sonography?

Breast sonography (also known as breast ultrasound or mammary sonography) is an imaging procedure that uses high-frequency sound waves to create detailed images of the breast tissue. Unlike mammography, breast sonography does not use ionizing radiation, making it a completely safe, painless, and well-tolerated examination that can be repeated as often as needed without health risks.

Indications and Applications

Breast sonography is used in a wide range of clinical situations, including:

Evaluation of palpable lumps or areas of firmness in the breast
Supplementing mammography, especially in women with dense breast tissue
Differentiating between fluid-filled cysts and solid masses
Monitoring known benign lesions such as fibroadenomas
Investigation of breast pain, swelling, or redness
Follow-up care during and after breast cancer treatment
Ultrasound-guided biopsies for tissue sampling
Breast examination in pregnant and breastfeeding women due to the absence of radiation

How Does Breast Sonography Work?

During the examination, the patient lies on her back, typically with one arm raised above the head. A water-based gel is applied to the breast to ensure optimal contact between the transducer (the ultrasound probe) and the skin, allowing sound waves to travel freely into the tissue. The transducer is gently moved across the breast surface in a systematic pattern. The reflected sound waves are processed in real time and displayed as a two-dimensional image on a monitor. Advanced devices also enable three-dimensional imaging and Doppler sonography, which allows assessment of blood flow within structures.

Diagnosis and Interpretation

The examining physician evaluates the structures observed in terms of their shape, size, margins, echogenicity (sound reflection pattern), and vascularity. Findings are typically classified according to the internationally recognized ACR BI-RADS system (Breast Imaging Reporting and Data System), which uses categories from BI-RADS 0 (incomplete assessment) to BI-RADS 6 (known malignancy). This standardized system facilitates communication between clinicians and guides the planning of further diagnostic steps.

Benign vs. Malignant Findings

Benign lesions such as simple cysts typically appear as well-defined, anechoic (dark) structures with posterior acoustic enhancement. Solid masses with irregular margins, heterogeneous internal structure, or increased vascularity may suggest a malignant process and usually require further evaluation, such as a core needle biopsy.

Advantages and Limitations

Advantages

No ionizing radiation – safe for all age groups, pregnant women, and breastfeeding mothers
Painless and well tolerated
Real-time visualization of tissue
Particularly effective for evaluating dense breast tissue
Reliable differentiation between cysts and solid lesions
Cost-effective and widely available

Limitations

Less sensitive for detecting microcalcifications, which may be early indicators of malignancy
Highly operator-dependent – image quality and interpretation rely on the examiner's expertise
Not currently established as a standard population-wide screening tool
May be more time-consuming in patients with very large breasts

Breast Sonography Compared to Other Imaging Methods

Breast sonography is most commonly used as a complementary technique alongside mammography. Mammography remains the standard screening method and is more sensitive for detecting microcalcifications, while ultrasound is superior for evaluating dense glandular tissue, younger patients, and differentiating cysts from solid masses. Breast MRI offers the highest sensitivity of all methods but is reserved for selected indications such as high-risk patients or inconclusive findings, due to its higher cost and limited availability.

References

Stavros AT et al. - Solid breast nodules: use of sonography to distinguish between benign and malignant lesions. Radiology. 1995;196(1):123-134.
Sardanelli F et al. - Breast ultrasound guidelines of the European Federation of Societies for Ultrasound in Medicine and Biology. Ultraschall Med. 2022;43(3):267-316.
American College of Radiology (ACR): ACR BI-RADS Atlas, 5th Edition. ACR, 2013.

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