Final Answer:
The typical mammographic appearance of round calcifications is characterized by well-defined, uniformly shaped, and evenly distributed calcifications on mammograms.
**Correct Option: 1. Well-defined, uniformly shaped, and evenly distributed calcifications on mammograms.**
Step-by-step explanation:
1. *Mammographic Appearance:* This phrase pertains to the visual representation of structures on mammograms, which are X-ray images of the breast tissue.
2. *Round Calcifications:* The focus here is on a specific type of calcifications, which are deposits of calcium within the breast tissue. In this context, the term "round" describes the shape of these calcifications.
3. *Well-Defined:* This characteristic implies that the borders of the round calcifications are clearly outlined and distinct, contributing to a defined appearance on the mammogram.
4. *Uniformly Shaped:* Round calcifications exhibit a consistent and regular shape, indicating a lack of irregularities or variations in their form.
5. *Evenly Distributed:* This aspect suggests that the round calcifications are spread evenly across the breast tissue, without clustering or asymmetry.
**Correct Option: 1. Well-defined, uniformly shaped, and evenly distributed calcifications on mammograms.**