What Is It?
An intraductal papilloma is a small, benign growth inside a milk duct. It can cause nipple discharge, especially when near the nipple. Nipple discharge has many causes—some normal and some that need evaluation.
How Common Is It?
Intraductal papillomas account for about 10% of benign breast lesions. Pathologic (concerning) nipple discharge is a relatively common reason for breast clinic visits.
Causes & Risk Factors
- Benign overgrowth of tissue lining a milk duct.
- Commonly diagnosed in adults, often ages 30–50.
- The chance of an underlying serious cause is higher when discharge is spontaneous, one-sided, from a single duct, and clear or bloody.
Symptoms
- Spontaneous discharge (clear, serous, or bloody), often from one breast and one duct.
- A small lump near the nipple (not always present).
- Occasional nipple tenderness.
- When Should You See a Doctor?
- Bloody or clear/watery discharge, especially if spontaneous and one-sided.
- New discharge in someone who is not pregnant or breastfeeding.
- Discharge with a lump, skin changes, or new nipple inversion.
- Any nipple discharge in men.
How Is It Diagnosed?
- History and exam (pattern, color, single vs multiple ducts).
- Ultrasound and/or diagnostic mammography based on age and findings.
- MRI in selected cases when initial imaging is negative but symptoms are concerning.
- Biopsy and/or removal of the lesion/duct may be recommended for definitive diagnosis.
Treatment Options
- Management depends on imaging and pathology findings.
- If discharge persists or is bothersome, duct excision can relieve symptoms and provide definitive tissue diagnosis.
- Treat other causes when present (infection, duct ectasia, medication-related galactorrhea, etc.).
Is It Cancerous?
Most papillomas are benign. Some are associated with atypical cells or, less commonly, cancer—this is why evaluation and, often, tissue diagnosis are recommended for concerning discharge.
Can It Affect Fertility or Pregnancy?
Papillomas do not affect fertility. During pregnancy and breastfeeding, discharge is often normal, but persistent lumps or unusual discharge should still be evaluated.
Key Takeaways for Patients
- Nipple discharge is often benign, but certain patterns need prompt evaluation.
- Concerning features: spontaneous, one-sided, single-duct, clear or bloody discharge.
- Ultrasound and mammography are common first tests; biopsy may be needed.
- Treatment ranges from monitoring to duct excision depending on findings.