What classic feature does a breast cancer mass show on a mammogram?

• A. Dense, round structure
• B. Spiculated mass
• C. Well-defined margin
• D. Cluster of microcalcifications

Answer: (B)

A spiculated mass on a mammogram is a classic feature associated with breast cancer. This appearance indicates that the mass has irregular, finger-like projections that extend into the surrounding breast tissue. This spiculation suggests that the tumor is infiltrating the tissue, which is often characteristic of malignancy.

In contrast, a dense, round structure might indicate a benign lesion or a cyst rather than a cancerous mass. A well-defined margin typically suggests a benign process as well, as malignant tumors usually do not have smooth and clearly defined borders. Clusters of microcalcifications can sometimes be associated with cancer but do not directly indicate the presence of a mass. Instead, they represent small deposits that may be benign or malignant, depending on their distribution and other imaging features.