ABSTRACT
Non-mass findings (NML) are areas in the breast tissue that have a different echogenicity than the surrounding tissue but do not form a mass. With advances in ultrasound technology in recent years, NML are being detected more frequently on ultrasonography (US) examinations. The use of secondary US guidance for biopsy of NML detected on contrast-enhanced mammography and breast magnetic resonance imaging has also increased the frequency of NML encounters in the daily US practice of breast radiologists. Since there is no corresponding term for NML in the current Breast Imaging Reporting and Data System ultrasound lexicon, there are different approaches in the literature to describe and classify the US findings of NML. Classification is mostly based on echogenicity and distribution. Associated findings include tubular and ductal structures, posterior shadowing, structural distortion, and calcifications. In the literature, 46-90% of non-mass lesions are reported as benign and 10-54% as malignant.
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