**Core Concept**
Popcorn calcification is a type of mammographic finding characterized by small, round, and well-defined calcium deposits within a breast lesion. This calcification pattern is often associated with benign lesions, particularly phyllodes tumors and fibroadenomas.

**Why the Correct Answer is Right**
The term "popcorn calcification" is derived from the appearance of these calcifications, which resemble the kernels of popcorn. They are typically small (less than 1 mm in diameter) and have a smooth, well-defined border. These calcifications are often seen within phyllodes tumors, which are rare, benign breast tumors that can grow rapidly. The calcifications in phyllodes tumors are thought to result from the degeneration of the tumor's stroma.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately describe the characteristic appearance of popcorn calcification.
**Option B:** This option is incorrect because it is a different type of calcification pattern seen in breast lesions, characterized by branching, linear, or segmental calcifications.
**Option C:** This option is incorrect because it is a type of breast cancer that is not typically associated with popcorn calcification.

**Clinical Pearl / High-Yield Fact**
Phyllodes tumors are rare, benign breast tumors that can grow rapidly and may be mistaken for malignant lesions on mammography. They are often characterized by a characteristic "popcorn" calcification pattern.

**Correct Answer:** B. Phyllodes tumors.