Patient's question:
The breasts always secrete clear fluid.Doctor's answer:
Analysis of the Condition: Hello! First of all, I wish you a speedy recovery! Let's discuss the issue of "female nipple discharge." In non-pregnant and non-lactating periods, if fluid is squeezed out of the nipple, it is called nipple discharge. Nipple discharge is one of the common symptoms of breast diseases. Statistics show that 3-14% of patients seeking medical attention for breast diseases primarily present with nipple discharge, with its incidence rate second only to breast lumps and breast pain.1) If the nipple discharge is from a single nipple, it is often related to the following breast diseases:
1. Mammary Duct Ectasia: Some patients with this condition may experience nipple discharge as an early symptom. The discharge is usually brown, occasionally bloody; laboratory tests reveal a large number of plasma cells and lymphocytes without tumor cells. This condition is more common in non-lactating women over 40 or postmenopausal women. The area around the nipple where discharge occurs may have a mass adhering to the skin, typically less than 3 cm in diameter. The ipsilateral axillary lymph nodes may be swollen, soft, and tender. If infection occurs, the mass may show signs of redness, swelling, heat, and pain.
2. Intraductal Papilloma: This condition is more common in women aged 40-50. 75% of the tumor is located near the nipple. The tumor is small, pedunculated, with villi, and has many thin-walled blood vessels, making it prone to bleeding. Tumor cells can be found in the discharge through laboratory tests. Sometimes, patients may notice a cherry-sized mass under the areola during careful palpation of the breast, which is soft, smooth, and mobile.
3. Breast Cystic Hyperplasia: This condition is more common in women of reproductive age. In some cases, the nipple discharge may be yellow-green, brown, bloody, or colorless serous fluid. Laboratory tests show no tumor cells in the discharge. This condition has two characteristics:
- It presents with cyclical breast pain, which tends to worsen before menstruation. Mild cases are often not bothersome, but severe cases may affect work and daily life.
- Breast masses are often multiple and may be unilateral or bilateral, localized to a part of the breast or scattered throughout. The masses are nodular, of varying sizes, firm but not hard, not attached to the skin, and have unclear boundaries with surrounding tissues. The masses may shrink after menstruation.
4. Breast Cancer: Some breast cancer patients may have bright red or dark red nipple discharge. At times, clear watery discharge may occur, which is colorless, transparent, occasionally sticky, and leaves no trace after leakage. Tumor cells can be found in the discharge through laboratory tests. The peak ages for this condition are 45-49 and 60-64. The onset is gradual, and patients may notice a breast mass unintentionally, often located in the inner or outer upper quadrant, painless, and gradually enlarging. In advanced stages, peau d'orange skin changes and satellite nodules may appear. Axillary lymph nodes may be swollen, hard, and fuse together as the disease progresses.
2) Additionally, the following points should be noted:
1. Is the discharge true or false? True discharge refers to fluid leaking from the breast ducts. False discharge is common in inverted nipples, where shed epithelial cells accumulate in the, causing a small, watery, bean-like leakage with an odor. Once the inverted nipple is pulled out and the area is kept clean, the "discharge" will disappear.
2. Is the discharge unilateral or bilateral? Bilateral discharge is often physiological. For example, within one year of stopping breastfeeding, most women may still secrete a small amount of milk. In late pregnancy, some women may express a small amount of pale colostrum from both breasts. A few women may experience temporary nipple discharge after intense sexual climax due to highly congested breast blood vessels, breast enlargement, and nipple erection. Postmenopausal women may secrete a small amount of milk due to endocrine disorders. All of these are physiological conditions and not pathological. However, bilateral nipple discharge can also be pathological, such as hypogonadotropic hypogonadism-prolactinoma syndrome, which is caused by a pituitary microadenoma. In addition to nipple discharge, it may be accompanied by amenorrhea, headaches, visual field constriction, and elevated prolactin levels in the blood. A brain CT scan can confirm the diagnosis. Another type of bilateral nipple discharge is seen in patients with minimal breast hyperplasia.
Advice:
3. Is the discharge from a single or multiple openings? The nipple has 15-20 openings for breast ducts. When discharge occurs, observe from which one or more openings the fluid is leaking. Single-opening discharge is often associated with intraductal papilloma. Multiple-opening discharge may be physiological, drug-related, due to systemic benign diseases, or breast hyperplasia.
4. Is the discharge spontaneous or induced by squeezing? The former is often pathological. Approximately 13% of breast cancer patients have a history of spontaneous discharge. Benign or physiological discharge is more commonly induced by squeezing.
5. What is the nature of the discharge? The characteristics of the discharge vary depending on the breast disease. For example:
- Milk-like discharge: Often physiological, such as in the immediate aftermath of weaning or miscarriage, and is not a sign of cancer.
- Purulent discharge: Often associated with duct ectasia or plasma cell mastitis.
- Light yellow discharge: The most common type of discharge and is seen in almost all breast diseases, most commonly breast hyperplasia. Some cases may be due to intraductal papilloma or breast cancer. Therefore, this warrants increased vigilance.
- Bloody discharge: Can be bright red, coffee-colored, light yellow, or brown. This type of discharge is a dangerous sign and should be highly. 50-75% of cases are due to intraductal papilloma, and 15% are due to breast cancer. If bloody discharge occurs postmenopause, 75% of cases are breast cancer.
- Watery discharge: Colorless and transparent, occasionally sticky, and leaves no trace after leakage. This type of discharge may be a sign of breast cancer and should undergo further examination.
In summary, nipple discharge is an important breast symptom, with 10-15% of cases potentially being breast cancer. If symptoms appear, seek medical attention promptly for discharge smear cytology. Near-infrared breast scanning has a positive diagnostic rate of 80-95% for duct lesions in the areola. Ultrasound and mammography also have considerable accuracy. Selective lesion ductography is a common examination method for nipple discharge and has significant value in differentiating benign and malignant conditions. It can also help doctors accurately locate the surgical resection area.
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