N61.23 Granulomatous mastitis, bilateral breast

Name of the Condition

• Granulomatous Mastitis, Bilateral Breast
• ICD-10 Code: N61.23

Summary

Granulomatous mastitis, bilateral breast, is a rare inflammatory condition affecting both breasts, characterized by non-caseating granulomas (clusters of immune cells) in breast tissue. It typically presents as firm, tender masses or swelling in both breasts, often accompanied by skin changes or nipple discharge. The condition is distinct from infectious mastitis and may mimic breast cancer, requiring careful evaluation to avoid misdiagnosis.

Causes

The exact cause of granulomatous mastitis is not fully understood, but it is thought to involve an abnormal immune response, possibly triggered by ductal obstruction, trauma, or autoimmune processes. Some cases have been associated with pregnancy, lactation, or underlying systemic conditions, though no single cause is universally accepted.

Risk Factors

• Pregnancy or lactation: Recent childbirth or breastfeeding may increase risk.
• Autoimmune conditions: History of systemic lupus erythematosus or other immune disorders.
• Ductal obstruction: Blockage of breast ducts, which can lead to inflammation.
• Trauma: Physical injury to the breast, including surgery or biopsy.

Symptoms

• Firm, palpable breast masses or swelling in both breasts.
• Breast pain or tenderness localized to both breasts.
• Skin changes, such as redness, thickening, or ulceration.
• Nipple discharge, which may be bloody or purulent.

Diagnosis

Diagnosis involves a combination of clinical evaluation, imaging (e.g., mammography or ultrasound), and tissue biopsy to confirm the presence of granulomas. Laboratory tests may rule out infection or other conditions. Imaging helps assess the extent of involvement and distinguish the condition from malignancy.

Treatment Options

Treatment may include anti-inflammatory medications, antibiotics (if infection is suspected), or corticosteroids to reduce inflammation. In some cases, surgical drainage or excision of the affected tissue is necessary. Management is tailored to the severity and underlying triggers.

Prognosis and Follow-Up

Prognosis is generally favorable with appropriate treatment, though recurrence is possible. Follow-up care involves monitoring for symptom resolution and regular breast examinations to detect any changes. Long-term outcomes depend on the underlying cause and response to therapy.

Complications

Potential complications include chronic inflammation, abscess formation, or scarring. Misdiagnosis as breast cancer may lead to unnecessary interventions. Rarely, untreated cases can result in persistent pain or functional impairment.

Lifestyle & Prevention

Maintaining breast health through regular self-examinations and prompt evaluation of new symptoms may aid early detection. Avoiding known triggers (e.g., trauma) and managing underlying conditions (e.g., autoimmune disorders) may reduce risk. Smoking cessation is advised if applicable.

When to Seek Professional Help

Seek medical attention if you experience persistent breast pain, new lumps, skin changes, or nipple discharge. Early evaluation is critical to rule out serious conditions like cancer and initiate appropriate treatment.

Tips for Medical Coders

Use N61.23 for bilateral granulomatous mastitis. Document the bilateral nature of the condition and any associated symptoms or findings. Ensure clinical correlation to support the diagnosis and differentiate from unilateral or unspecified cases.