How does one distinguish heterogeneous dystrophic and heterogeneous malignant calcifications from each other?

Old exams
The dystrophic type tends to increase in coarseness but not number and involves the same area over time, often where a benign density (e.g., a fibroadenoma) is decreasing in size. The malignant heterogeneous calcifications spread out and increase in number over time, often in a ductal distribution.