Fibrocystic changes (previously known as fibrocystic disease) is a benign breast condition consisting of fibrous (rubbery) and cystic changes in the breast. It’s a catchall term that refers to wide variety of benign histologic changes in the breast epithelium. The condition is common in women 30-50 years of age and may cause breast pain that varies with the menstrual cycle. Typically, ultrasonography is done to differentiate solid from cystic masses. Fine-needle aspiration (FNA) usually demonstrates straw-colored or green fluid.
A fibroadenoma is the most common breast tumor in women younger than 30 years of age. It is a benign neoplasm consisting of glandular and fibrous tissue. It is typically a painless, well-circumscribed, round, mobile mass. The tumor can be followed clinically or excised if the diagnosis is uncertain.