What does “BI-RADS Category 3” mean for a breast nodule?

With the accelerating pace of modern life, many women are prone to developing breast nodules. What, then, does “BI-RADS Category 3” mean?

What Does BI-RADS Category 3 Mean?

This classification pertains to the assessment of breast nodule benignity or malignancy and falls under the Breast Imaging Reporting and Data System (BI-RADS®), applicable to both mammography and ultrasound examinations. A BI-RADS Category 3 finding indicates a high likelihood of benignity, with a malignancy risk of 0–2%. Routine follow-up imaging is recommended at six-month intervals. If the nodule remains stable over two to three consecutive years, it may be downgraded to BI-RADS Category 2—indicating a definitively benign lesion. However, if the nodule is relatively large, surgical intervention may be warranted.

There are numerous causes of breast nodules, detailed as follows: First, under physiological conditions, normal breast tissue naturally comprises numerous small nodules—soft, uniform, and symmetrically distributed in both breasts. These small nodules often fluctuate in size throughout the menstrual cycle: they may enlarge slightly before menstruation and shrink afterward, remaining soft in consistency. Second, other types of nodules—such as those associated with skin surface changes—may present with erythema and swelling, or manifest as inflammatory nodules—for example, acute mastitis. In fact, many such cases involve not discrete small nodules but rather larger, confluent masses.

Patients diagnosed with BI-RADS Category 3 breast nodules should cooperate with their physicians for appropriate management and maintain a positive mindset while adhering to scheduled follow-up examinations. I hope this response has been helpful. Wishing you good health and happiness!