What Is Granulomatous Mastitis?
Granulomatous mastitis is a rare, chronic inflammatory breast condition that involves the formation of granulomas (clusters of immune cells) in breast tissue. It typically affects women of childbearing age, especially those who have recently been pregnant or breastfeeding. Although it can mimic breast cancer in appearance and feel, it is a benign (non-cancerous) condition.
Granulomatous mastitis may resolve on its own or require medical or surgical treatment, depending on severity and recurrence.
What Causes Granulomatous Mastitis?
The exact cause is not fully understood, but several potential contributing factors have been identified:
- Autoimmune response – The body’s immune system mistakenly attacks its own breast tissue
- Hormonal influences – Often occurs postpartum or during breastfeeding
- Bacterial infection – Especially Corynebacterium kroppenstedtii
- Local trauma or milk stasis – May trigger inflammation
- Reaction to foreign material – Such as remnants from milk ducts or minor injury
It is not contagious and is not caused by cancer.
What Are the Symptoms of Granulomatous Mastitis?
Symptoms usually develop gradually and may include:
- A painful lump or mass in the breast
- Redness and swelling over the affected area
- Skin thickening or dimpling
- Nipple discharge or inversion
- Abscess formation or fistulas (draining sinuses)
- Warmth and tenderness
- Enlarged lymph nodes under the arm
The condition may affect one or both breasts and can resemble an infection or tumor.
How Is Granulomatous Mastitis Diagnosed?
Since it mimics other breast conditions, a thorough evaluation is needed to confirm the diagnosis:
- Physical exam – Palpation of the lump and surrounding tissues
- Ultrasound or mammogram – To evaluate the structure of the lump
- MRI of the breast – In selected cases for better imaging
- Biopsy – Core needle or surgical biopsy is essential to rule out cancer and identify granulomas
- Microbial cultures – To rule out infection, especially tuberculosis or Corynebacterium
What Are the Treatment Options for Granulomatous Mastitis?
Treatment depends on the severity of symptoms and whether an infection is present:
- Observation – In mild cases, the condition may resolve on its own
- Antibiotics – If a bacterial infection is identified
- Corticosteroids – To reduce inflammation and immune response
- Immunosuppressive drugs – In recurrent or severe autoimmune cases
- Surgical drainage – For abscesses or fluid collection
- Excision surgery – In persistent or recurrent cases, removal of the affected tissue may be needed
- Supportive care – Including pain relief and wound management
What Complications Can Occur from Granulomatous Mastitis?
If not properly managed, granulomatous mastitis can lead to:
- Chronic or recurrent abscesses
- Scarring and breast deformity
- Prolonged pain and discomfort
- Misdiagnosis or delayed diagnosis due to similarity to cancer
- Psychological distress from ongoing symptoms
Can Granulomatous Mastitis Be Prevented?
There is no guaranteed way to prevent granulomatous mastitis, but some general measures may help:
- Early evaluation of any breast lumps or changes
- Prompt treatment of infections or clogged ducts
- Good breastfeeding practices to avoid milk stasis
- Follow-up with healthcare providers during postpartum period
How to Manage Granulomatous Mastitis for Better Quality of Life?
For Individuals:
- Follow your treatment plan as prescribed
- Monitor for recurrence of symptoms
- Practice breast self-awareness and report any new changes
- Manage stress and seek support if dealing with prolonged illness