Figure 6.

Examples of DCIS presenting on ultrasound in three patients. In the first example (A), a round-shaped mass with circumscribed margins and heterogeneous echogenicity (calipers) revealed low-grade DCIS on pathology. In the second example (B), an irregular-shaped mass with angular and indistinct margins with associated microcalcifications (white arrow) and “pseudomicrocysts” (gray arrow) is present at the site of a clinically palpable mass. Biopsy revealed high-grade DCIS, and mammography confirmed the presence of fine pleomorphic calcifications within the mass. In the third example (C), there is duct ectasia (arrows) with low-level echoes within the ducts, which corresponded to a new mammographic focal asymmetry. Biopsy of this finding revealed papillary DCIS with a focus of microinvasion.