Unilateral Breast Swelling and Pain in a 68-Year-Old Male: Differential Diagnosis
In a 68-year-old male with unilateral breast swelling and pain, gynecomastia is the most common cause, but breast cancer must be actively excluded given his age (median age for male breast cancer is 63 years) and the unilateral presentation. 1
Primary Differential Diagnoses
Most Common: Gynecomastia
Critical to Exclude: Breast Cancer
- Represents 3-11% of unilateral male breast masses in older men 2, 3, 4
- Red flag features that suggest malignancy:
- Hard, fixed mass (not mobile)
- Eccentric or peripheral to the nipple (not subareolar)
- Painless presentation (pain argues against cancer)
- Longer duration before presentation (median 33 months vs 3.4 months for gynecomastia) 4
- Associated nipple retraction, skin changes, nipple discharge, or lymphadenopathy 1, 5
- Personal history of cancer or family history of breast cancer 4
Other Benign Causes
- Lipomas (11% of cases) 3
- Epidermal inclusion cysts/oil cysts 1, 5
- Pseudogynecomastia (fatty tissue deposition, especially with elevated BMI) 1
- Chronic mastitis (rare) 2
- Accessory breast tissue (very rare in males, typically axillary) 6, 7
Rare Systemic Causes
- Metastatic disease (e.g., lymphoma) 2
- Sarcoidosis (extremely rare, presents with granulomatous inflammation) 8
Clinical Approach Algorithm
Step 1: History Assessment
Look specifically for:
- Duration of symptoms (acute <6 months suggests gynecomastia; chronic >33 months raises cancer concern)
- Pain characteristics (painful = more likely gynecomastia)
- Medication review (60% of gynecomastia cases have causative medications) 3
- Personal or family history of breast cancer 4
- Alcohol use, smoking (more common with gynecomastia) 4
Step 2: Physical Examination
Assess for:
- Location: Subareolar (gynecomastia) vs eccentric/peripheral (cancer concern)
- Consistency: Soft/rubbery/mobile (gynecomastia) vs hard/fixed (cancer)
- Skin changes: Retraction, ulceration, or thickening (cancer)
- Nipple changes: Discharge or retraction (cancer)
- Lymphadenopathy: Axillary nodes (cancer)
Step 3: Imaging Decision
For a 68-year-old male with unilateral breast mass, diagnostic mammography is the recommended initial imaging study because breast cancer incidence increases significantly with age (median 63 years). 1
- If clinical exam is clearly consistent with gynecomastia (soft, mobile, subareolar, tender), imaging may not be routinely required 1
- However, given the patient's age (68) and unilateral presentation, proceed with mammography to exclude malignancy 1
- Ultrasound alone is not recommended as initial imaging in this age group 1
Step 4: Tissue Diagnosis When Indicated
Core needle biopsy is safe and effective for diagnostic uncertainty in unilateral male breast masses 2
Indications for biopsy:
- Mammographic findings suspicious for malignancy
- Hard, fixed, or eccentric mass on exam
- Associated red flag features (nipple changes, skin changes, lymphadenopathy)
- Inability to distinguish benign from malignant on clinical and imaging grounds
Critical Pitfalls to Avoid
- Do not assume all unilateral breast masses in older men are benign gynecomastia - 3-11% are malignant 2, 3
- Do not be falsely reassured by pain - while pain favors gynecomastia, it does not exclude cancer 3
- Do not skip imaging in men ≥25 years with unilateral masses - age-appropriate cancer risk mandates mammography 1
- Do not be falsely reassured by medication history - 27-29% of cancer patients also take gynecomastia-inducing drugs 4
- Remember that 50% of men with breast cancer have coexisting gynecomastia - one does not exclude the other 1