The correct answer is C: Fibrocystic disease
Comment: Fibrocystic disease (condition) is a hormonally associated benign mammary disorder affecting about 60% of women. The hormonal changes during the menstrual cycle cause the mammary gland to feel swollen, painful, and "lumpy." Following menopause the changes usually subside. However, in cases of PHTS and history, there is an increased risk for mammary malignancy. The solid nests have irregular slits which are considered benign. The cysts are apocrine cysts. Click here for the comparative pathology.
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