Breast Imaging Report and Data System (BIRADs)

What is BI-RADS and how is it read?

BI-RADS is the international standard for grading the level of suspicion of breast imaging (mammography and ultrasound), from category 0 to 6, which guides the next step — further tests, follow-up, or biopsy. Understanding it helps patients read their own results.

 Breast Imaging Report and Data System (BIRADs)

Article by Assoc. Prof. Dr. Youwanush Kongdan and Dr. Paweena Lueadthai

Breast cancer screening through mammograms and ultrasounds is widespread today. However, interpreting the results on your own can be challenging due to the specialized terminology. Physicians must explain the results and provide management guidelines. This article aims to simplify the interpretation of screening results for self-understanding.

Findings in Radiologist Reports

Cysts

• Cyst or Simple Cyst: Indicates a fluid-filled sac; generally not a cause for concern.

• Complicated Cyst: May contain some solid material; requires monitoring.

• Intracystic Mass: A mass within a cyst; may indicate malignancy and needs careful evaluation.

Cysts are not cancerous or tumors. Previously classified as a type of breast disease, they are now understood as part of normal hormonal changes during the menstrual cycle. Cysts can form from residual changes in the breast tissue after ovulation.

Calcification

• Microcalcification: Tiny calcium deposits (<0.5 mm) that can be benign or malignant.

• Macrocalcification: Larger calcium deposits (>0.5 mm), typically benign.

Microcalcifications, especially when clustered or following a linear branching pattern, may suggest breast cancer and require further investigation.

Masses

• Benign vs. Malignant: Benign masses have well-defined borders, while malignant masses may have ill-defined, lobulated, irregular, or spiculated borders.

• Increased Vascularization: Indicates increased blood supply, which could be due to inflammation or cancer.

BIRADs Reporting System

The Breast Imaging Reporting and Data System (BIRADs) standardizes the reporting of mammogram and ultrasound findings, developed by the American College of Radiology (ACR). It helps in communicating results, understanding risks, and planning appropriate care.

BIRADs Categories

Each BIRADs category reflects different levels of concern and management recommendations:

BIRADs 0 – Incomplete

• Explanation: Requires additional imaging, such as further mammograms or ultrasounds.

• Management: Follow up as recommended by the radiologist.

BIRADs 1 – Negative

• Explanation: No abnormalities detected.

• Cancer Probability: 0%

• Management: Routine screening as scheduled (typically every 1-2 years).

BIRADs 2 – Benign

• Explanation: Findings like cysts or benign lumps.

• Cancer Probability: 0%

• Management: Routine screening as scheduled (typically every 1-2 years).

BIRADs 3 – Probably Benign

• Explanation: Findings are likely benign but should be monitored.

• Cancer Probability: ≤2%

• Management: Follow-up every 6 months to 1 year until stable.

BIRADs 4 – Suspicious Abnormality

• Explanation: Findings have a higher risk of being cancerous and need further investigation.

• Subcategories:

BIRADs 4A: Low suspicion (2-10%)

BIRADs 4B: Moderate suspicion (10-50%)

BIRADs 4C: High suspicion (50-95%)

• Management: Biopsy recommended to confirm diagnosis.

BIRADs 5 – Highly Suggestive of Malignancy

• Explanation: High likelihood of cancer.

• Cancer Probability: >95%

• Management: Immediate additional testing and planning for treatment, such as biopsy and further management.

BIRADs 6 – Known Biopsy-Proven Malignancy

• Explanation: Cancer confirmed by biopsy.

• Cancer Probability: 100%

• Management: Proceed with cancer treatment plan, including surgery, radiation, or chemotherapy.

Summary

BIRADs provides a clear framework for reporting and managing breast imaging results, ensuring effective communication and appropriate care. Consult with a physician for personalized advice and management based on your BIRADs category.

หมายเหตุ: ผลการรักษาขึ้นอยู่กับลักษณะของโรคและสภาพผู้ป่วยแต่ละราย ไม่สามารถรับประกันผลลัพธ์ที่ตายตัวได้ กรุณาปรึกษาแพทย์เพื่อแผนการรักษาเฉพาะบุคคล

Frequently Asked Questions (FAQ)

What do the BI-RADS categories mean?

0 needs more assessment, 1 normal, 2 benign, 3 probably benign (follow-up), 4 suspicious (biopsy advised), 5 highly suspicious, 6 confirmed cancer.

Is BI-RADS 3 worrying?

Category 3 means probably benign with a very low cancer risk; follow-up imaging at a set interval is usually advised.

Does BI-RADS 4 need a biopsy?

Generally yes — category 4 is suspicious and biopsy is advised to confirm benign or malignant.

What does BI-RADS 0 mean?

The result is incomplete and needs further imaging (extra views or ultrasound) before a category is assigned.

Is BI-RADS used for both mammography and ultrasound?

Yes — it is the same system used to report mammography, ultrasound, and MRI.

Related reading

• Screening & diagnosis: complete guide

• Breast biopsy: complete guide

Disclaimer: This information is for general education only and is not a substitute for personalised medical advice. Please consult a qualified specialist.