SUMMARYUltrasound examination will not always identify the malignant calcifications of ductal carcinomain situ.However, the potential benefits of ultrasound examination of suspicious breast microcalcifications lie first in identifying a mass lesion associated with the calcifications and second in guiding fine needle cytology, core biopsy and hookwire localization. Because of these benefits it is recommended that ultrasound examination be performed as part of the evaluation of mammographic microcalcifications which are considered suspicious or diagnostic of malignancy.