What is an absolute indication for a breast ultrasound?

• A. Palpable mass
• B. Suspected malignancy in a mammogram
• C. Follow-up of a known cyst
• D. Deciding on breast reduction surgery

Answer: (B)

An absolute indication for a breast ultrasound is suspected malignancy in a mammogram. When a mammogram raises concerns about potential cancer, such as the identification of masses, architectural distortion, or calcifications that could indicate malignancy, a breast ultrasound is performed as a complementary imaging technique. This additional imaging helps provide further evaluation of the suspicious areas identified on the mammogram. Ultrasound can assist in differentiating between solid masses and cysts, guide biopsies if needed, and assess lymph nodes for any signs of cancer spread. This critical role in the diagnostic process underscores why suspicion of malignancy warrants an ultrasound, making it an essential component in the work-up of breast abnormalities.

Other scenarios, although important, do not serve as absolute indications for ultrasound. For example, a palpable mass might necessitate an ultrasound, but this can be contingent on findings from other imaging or clinical assessments. Similarly, follow-up of a known cyst may also require an ultrasound but isn’t an absolute indication in cases where previous assessments have established stable characteristics. Deciding on breast reduction surgery typically involves different clinical considerations that do not directly relate to the need for ultrasound imaging.