Chapter 17

### Fibrocystic Condition

#### Essentials of Diagnosis

• Painful, often multiple, usually bilateral masses in the breast.
• Rapid fluctuation in the size of the masses is common.
• Frequently, pain occurs or worsens and size increases during premenstrual phase of cycle.
• Most common age is 30–50. Rare in postmenopausal women not receiving hormonal replacement.

#### General Considerations

Fibrocystic condition is the most frequent lesion of the breast. Although commonly referred to as “fibrocystic disease,” it does not, in fact, represent a pathologic or anatomic disorder. It is common in women 30–50 years of age but rare in postmenopausal women who are not taking hormonal replacement. Estrogen is considered a causative factor. There may be an increased risk in women who drink alcohol, especially women between 18 and 22 years of age. Fibrocystic condition encompasses a wide variety of benign histologic changes in the breast epithelium, some of which are found so commonly in normal breasts that they are probably variants of normal but have nonetheless been termed a “condition” or “disease.”

The microscopic findings of fibrocystic condition include cysts (gross and microscopic), papillomatosis, adenosis, fibrosis, and ductal epithelial hyperplasia. Although fibrocystic condition has generally been considered to increase the risk of subsequent breast cancer, only the variants with a component of epithelial proliferation (especially with atypia) represent true risk factors.

#### Clinical Findings

##### Symptoms and Signs

Fibrocystic condition may produce an asymptomatic mass in the breast that is discovered by accident, but pain or tenderness often calls attention to it. Discomfort often occurs or worsens during the premenstrual phase of the cycle, at which time the cysts tend to enlarge. Fluctuations in size and rapid appearance or disappearance of a breast mass are common with this condition as are multiple or bilateral masses and serous nipple discharge. Patients will give a history of a transient lump in the breast or cyclic breast pain.

##### Diagnostic Tests

Mammography and ultrasonography should be used to evaluate a mass in a patient with fibrocystic condition. Ultrasonography alone may be used in women under 30 years of age. Because a mass due to fibrocystic condition is difficult to distinguish from carcinoma on the basis of clinical findings, suspicious lesions should be biopsied. Fine-needle aspiration (FNA) cytology may be used, but if a suspicious mass that is nonmalignant on cytologic examination does not resolve over several months, it should be excised. Surgery should be conservative, since the primary objective is to exclude cancer. Occasionally, core needle biopsy or FNA cytology will suffice. Simple mastectomy or extensive removal of breast tissue is rarely, if ever, indicated for fibrocystic condition.

#### Differential Diagnosis

Pain, fluctuation in size, and multiplicity of lesions are the features most helpful in differentiating fibrocystic condition from carcinoma. If a dominant mass is present, the ...

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