On mammography, which finding is most strongly associated with breast malignancy?

• A. A well-defined round cyst
• B. Diffuse glandular thickening
• C. Calcifications without spiculation
• D. Microcalcifications with spiculated masses

Answer: (D)

On mammography, the strongest sign of malignancy is a lesion that shows microcalcifications in conjunction with a spiculated mass. Spiculation—radiating lines from the lesion—reflects invasive growth into surrounding breast tissue and a desmoplastic response, which is highly suggestive of cancer. The accompanying microcalcifications often arise from tumor necrosis or rapid cell turnover, and patterns such as fine, pleomorphic, or branching calcifications further raise concern.

Other findings tend to be benign or less specific: a well-defined round cyst is typically a benign fluid-filled structure; diffuse glandular thickening can be seen with hormonal changes or inflammatory processes; calcifications without spiculation may be benign calcifications. But the combination of microcalcifications with a spiculated mass carries the strongest association with malignancy.