Okay, let's tackle this question. The patient is a 35-year-old woman with lumpy breasts, no masses found on exam, and the doctor says it's fibrocystic changes. The question is asking for a pathologic finding consistent with the nonproliferative form of fibrocystic changes.

First, I need to recall what fibrocystic changes (also called fibrocystic disease or fibrocystic breast changes) are. They are benign changes in the breast tissue that can cause lumps or thickening. These changes are common and often related to hormonal fluctuations, especially estrogen and progesterone. Fibrocystic changes can be classified into proliferative and nonproliferative types based on the presence of cell proliferation.

The nonproliferative form would not have increased cell proliferation. So, the pathologic findings would include things like cysts, fibrosis, and maybe some fluid-filled spaces without significant cell growth. On the other hand, the proliferative type would show increased epithelial or stromal cell proliferation, which can be associated with a higher risk of breast cancer.

Common nonproliferative findings include cysts, apocrine metaplasia, and mild fibrosis. Proliferative types might show epithelial hyperplasia, atypical hyperplasia, or increased cellularity. The question is about nonproliferative, so the answer should be something like cysts without epithelial proliferation.

Looking at the options (though they aren't listed here), the correct answer would likely be something like "cysts with no epithelial proliferation" or "fibrocystic changes with cystic spaces and fibrosis." The other options might include features like epithelial hyperplasia, atypia, or other proliferative changes which are not part of the nonproliferative category.

I need to make sure that the explanation clearly differentiates between proliferative and nonproliferative forms. The nonproliferative type is benign, doesn't have increased cell proliferation, and is associated with typical cystic changes. The proliferative forms have more cell growth and are considered high-risk for cancer.

So, the core concept is fibrocystic changes classification. The correct answer would be a finding that doesn't involve epithelial or stromal proliferation. The wrong options would include proliferative features. The clinical pearl is to distinguish between the two types for risk assessment.

**Core Concept**
Fibrocystic changes are benign breast conditions categorized into nonproliferative and proliferative forms. Nonproliferative variants lack epithelial or stromal hyperplasia, featuring cystic spaces, fibrosis, and apocrine metaplasia, while proliferative forms involve increased cellularity and carry a higher breast cancer risk.

**Why the Correct Answer is Right**
Nonproliferative fibrocystic changes are characterized by fluid-filled cysts, fibrous stroma, and apocrine metaplasia without epithelial or stromal hyperplasia. These changes are hormonally driven, often resolving post-menopause. Pathologically, the absence of atypical hyperplasia or epithelial proliferation distinguishes nonproliferative from proliferative forms. Classic findings include cystic dilatation of terminal ducts and mild fibrosis.

**Why Each Wrong Option is Incorrect**
**Option A

✓ Correct Answer: A. A blue-domed cyst