How should a male patient presenting with a breast mass be evaluated and managed?

Evaluation and Management of Male Breast Mass

For a male patient presenting with a breast mass, begin with bilateral diagnostic mammography if age ≥25 years (or ultrasound if <25 years), followed by targeted ultrasound if mammography is indeterminate or suspicious, and proceed to image-guided core needle biopsy for any suspicious findings. 1

Initial Clinical Assessment

Perform a focused physical examination to distinguish gynecomastia from potential malignancy before ordering imaging. 2

Key clinical features to assess:

• Gynecomastia typically presents as a soft, rubbery, or firm mobile mass directly under the nipple, often painful (especially if present <6 months), and bilateral in ~50% of cases. 2
• Suspicious features requiring immediate imaging include: unilateral mass, hard or fixed consistency, eccentric location (not subareolar), nipple retraction, skin changes, bloody nipple discharge, or palpable lymphadenopathy. 1, 2, 3
• Most men with clear clinical gynecomastia or pseudogynecomastia (fatty tissue only) do not require imaging, as routine imaging leads to unnecessary benign biopsies. 2, 4

Age-Based Imaging Algorithm

Men ≥25 Years Old

Start with bilateral diagnostic mammography or digital breast tomosynthesis (DBT) as the initial imaging study. 1, 2, 5

• Mammography demonstrates 92-100% sensitivity, 90-96% specificity, and 99-100% negative predictive value for distinguishing benign from malignant disease in males. 1, 5
• Bilateral imaging is routinely performed to assess for symmetry and detect occult contralateral disease. 1
• If mammography is indeterminate or suspicious, proceed to targeted ultrasound to further characterize the lesion and guide biopsy. 1, 5

Men <25 Years Old

Begin with targeted ultrasound as the initial imaging modality, because breast cancer is extremely rare in this age group. 1, 2, 4

• If ultrasound shows suspicious or indeterminate features, proceed to mammography or DBT before making a biopsy recommendation. 2
• This approach prevents unnecessary biopsies, as gynecomastia and benign lesions can appear suspicious on ultrasound but are typically diagnosed as benign on mammography. 2

Biopsy Technique When Indicated

Image-guided core needle biopsy is the procedure of choice for suspicious breast masses, superior to fine-needle aspiration in sensitivity, specificity, and histological grading. 2, 5

Guidance method selection:

• Use ultrasound guidance when the lesion is visible on ultrasound (preferred due to real-time visualization, patient comfort, no radiation, and sampling accuracy). 2, 5
• Use stereotactic guidance for lesions visible only on mammography. 2
• Use DBT guidance for lesions visible only on tomosynthesis. 2
• Place a marker clip post-biopsy to document sampling location and perform post-biopsy imaging to confirm marker placement. 2, 5

Critical Considerations

Male breast cancer has a median age of 63 years and frequently presents at advanced stage with larger tumors and higher probability of nodal metastases. 1, 5

• The malignancy risk in men >60 years with pathologic nipple discharge reaches 32%. 6
• Approximately 50% of men with breast cancer may have coexisting gynecomastia, but gynecomastia itself is NOT a risk factor for breast cancer. 5
• Imaging should always precede biopsy, as post-biopsy changes may confuse image interpretation. 2

Common Pitfalls to Avoid

• Do not assume bilateral presentation excludes malignancy, especially in elderly males. 6
• Do not skip mammography in men ≥25 years, even if ultrasound appears benign, when clinical suspicion exists. 1
• Do not perform routine imaging for clear clinical gynecomastia without suspicious features, as this increases unnecessary biopsies without improving outcomes. 2, 4
• Do not rely on pain or lack thereof to distinguish gynecomastia from cancer—both can be asymptomatic or painful. 7