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Endocrinology

Gynecomastia

Evaluate gynecomastia by separating typical pubertal or drug-related disease from hypogonadism, systemic illness, hormone-secreting tumors, and male breast cancer. Focus testing on atypical, progressive, or unexplained presentations; withdraw reversible exposures and reserve surgery for persistent, consequential disease.

Clinical question: How should clinicians evaluate gynecomastia, identify secondary causes, and select observation, cause-directed treatment, or surgery?

Initial assessment

Which gynecomastia presentations need urgent exclusion of malignancy or endocrine disease?

Begin with phenotype and tempo before ordering a broad endocrine panel.

Document onset, progression, laterality, tenderness, nipple discharge, sexual function, change in virilization, weight change, hyperthyroid symptoms, and recent recovery from malnutrition or serious illness. Review prescription and nonprescription agents, supplements and herbal products, cosmetic exposures, cannabis and other recreational substances, and anabolic-androgenic steroid use. Also ask about renal disease, liver disease, thyroid disease, infertility, and family or syndromic features suggesting Klinefelter syndrome. Wolters KluwerGynecomastia in adolescents : Current Opinion in PediatricsScienceDirect1 Testosterone - an overview | ScienceDirect Topicsccjm[PDF] Gynecomastia - Cleveland Clinic Journal of MedicinePubMed[Disordered hormone regulation in gynecomastia] - PubMed

Examine whether enlargement is palpable subareolar glandular tissue versus predominantly adiposity, then assess regional lymph nodes, skin and nipple findings, thyroid, abdomen for hepatomegaly or mass, body hair and other virilization, and both testes for volume asymmetry, atrophy, or a discrete mass. A breast mass suspicious for malignancy requires mammography and biopsy rather than empiric hormonal therapy. ScienceDirect1 Testosterone - an overview | ScienceDirect Topicsccjm[PDF] Gynecomastia - Cleveland Clinic Journal of Medicine

Recent, prominent, painful, progressive, or otherwise unexplained enlargement warrants directed evaluation because it can signal drug exposure, gonadal failure, altered estrogen production, renal or hepatic disease, thyrotoxicosis, or a tumor. Conversely, an adolescent with otherwise typical pubertal development, a reassuring breast and testicular examination, and no concerning history generally does not need routine hormonal testing. Wolters KluwerGynecomastia in adolescents : Current Opinion in PediatricsPubMed[Disordered hormone regulation in gynecomastia] - PubMedplasticsurgeryMost Teens with Gynecomastia Don't Need Hormone Lab Tests | ASPS

Phenotype-based initial branch points in gynecomastia evaluation. Wolters KluwerGynecomastia in adolescents : Current Opinion in PediatricsScienceDirect1 Testosterone - an overview | ScienceDirect Topicsccjm[PDF] Gynecomastia - Cleveland Clinic Journal of MedicinePubMed[Disordered hormone regulation in gynecomastia] - PubMedplasticsurgeryMost Teens with Gynecomastia Don't Need Hormone Lab Tests | ASPS
Clinical patternImmediate next actionWhat the result changes
Typical pubertal presentation with normal examination and no concerning exposure or systemic featuresReassure and observe; avoid routine endocrine testing. Wolters KluwerGynecomastia in adolescents : Current Opinion in PediatricsplasticsurgeryMost Teens with Gynecomastia Don't Need Hormone Lab Tests | ASPSMost cases regress during follow-up; investigate only if course or examination becomes atypical. PubMedGynecomastia: Clinical evaluation and management
Recent, progressive, painful, prominent, or unexplained enlargementObtain directed hormonal and systemic laboratory evaluation. ccjm[PDF] Gynecomastia - Cleveland Clinic Journal of MedicinePubMed[Disordered hormone regulation in gynecomastia] - PubMedIdentifies hypogonadism, thyroid, renal, hepatic, adrenal, or tumor-associated pathways requiring cause-directed management. ccjm[PDF] Gynecomastia - Cleveland Clinic Journal of Medicine
Suspicious breast examinationMammography and biopsy. ScienceDirect1 Testosterone - an overview | ScienceDirect Topicsccjm[PDF] Gynecomastia - Cleveland Clinic Journal of MedicineEstablishes or excludes breast malignancy before nonoperative management.
Testicular mass, atrophy, or abnormal hCG, estradiol, or gonadotropinsTesticular ultrasonography. Wolters KluwerMultidisciplinary Team Care: Adolescent Breastccjm[PDF] Gynecomastia - Cleveland Clinic Journal of MedicineDirects evaluation for testicular pathology or altered gonadal function.

Diagnostic workup

Which laboratory tests are indicated, and how should results direct imaging?

Test selectively when history or examination does not identify a benign physiologic or exposure-related explanation.

For recent-onset or unexplained gynecomastia, measure serum total and free or bioavailable testosterone, LH, FSH, estradiol, beta-hCG, prolactin, thyroid-stimulating hormone with free thyroxine, serum creatinine, and liver enzymes. Add DHEA-S or urinary 17-ketosteroids when a feminizing adrenal tumor is in the differential. These tests distinguish androgen deficiency, altered gonadotropin signaling, hCG- or estradiol-associated tumor physiology, hyperprolactinemia, thyrotoxicosis, and renal or hepatic contributors. ccjm[PDF] Gynecomastia - Cleveland Clinic Journal of MedicinePubMed[Disordered hormone regulation in gynecomastia] - PubMed

Interpret hormone results as a pattern rather than in isolation. Low testosterone with altered LH and FSH supports evaluation for hypogonadism; elevated beta-hCG or estradiol, or depressed LH in an otherwise unexplained presentation, should prompt testicular ultrasonography. If testicular ultrasonography is normal despite these abnormalities, proceed to chest radiography and abdominal CT to search for an extratesticular or adrenal source. Wolters KluwerMultidisciplinary Team Care: Adolescent BreastScienceDirect1 Testosterone - an overview | ScienceDirect Topics

Reserve pituitary MRI for a laboratory or clinical pattern that localizes to the sella, rather than using it as routine imaging. Similarly, adrenal CT should follow clinical or biochemical concern for an adrenal mass. Routine imaging without examination or laboratory triggers is not recommended. ccjm[PDF] Gynecomastia - Cleveland Clinic Journal of Medicine

Targeted tests and downstream actions for unexplained or atypical gynecomastia. Wolters KluwerMultidisciplinary Team Care: Adolescent BreastScienceDirect1 Testosterone - an overview | ScienceDirect Topicsccjm[PDF] Gynecomastia - Cleveland Clinic Journal of MedicinePubMed[Disordered hormone regulation in gynecomastia] - PubMed
Test or findingEtiologic branchNext action
Total/free testosterone with LH and FSHAndrogen deficiency or abnormal gonadotropin signaling. ScienceDirect1 Testosterone - an overview | ScienceDirect Topicsccjm[PDF] Gynecomastia - Cleveland Clinic Journal of MedicineEvaluate the hypogonadal pattern and its cause; assess fertility when relevant. ScienceDirect1 Testosterone - an overview | ScienceDirect Topics
Beta-hCG or estradiol elevation; depressed LHPossible testicular or extratesticular hormone-secreting process. Wolters KluwerMultidisciplinary Team Care: Adolescent BreastScienceDirect1 Testosterone - an overview | ScienceDirect TopicsPerform testicular ultrasonography; if normal, obtain chest radiography and abdominal CT. Wolters KluwerMultidisciplinary Team Care: Adolescent Breast
TSH and free thyroxine abnormalityThyroid hormone excess or other thyroid dysfunction. ccjm[PDF] Gynecomastia - Cleveland Clinic Journal of MedicinePubMed[Disordered hormone regulation in gynecomastia] - PubMedTreat or further evaluate thyroid disease as the reversible contributor. ccjm[PDF] Gynecomastia - Cleveland Clinic Journal of Medicine
Elevated creatinine or liver enzymesRenal or hepatic disease. ccjm[PDF] Gynecomastia - Cleveland Clinic Journal of MedicinePubMed[Disordered hormone regulation in gynecomastia] - PubMedEvaluate and manage underlying systemic disease. ccjm[PDF] Gynecomastia - Cleveland Clinic Journal of Medicine
DHEA-S or urinary 17-ketosteroid abnormality when adrenal tumor suspectedFeminizing adrenal tumor pathway. ccjm[PDF] Gynecomastia - Cleveland Clinic Journal of MedicineProceed to adrenal imaging directed by the clinical and biochemical presentation. ccjm[PDF] Gynecomastia - Cleveland Clinic Journal of Medicine
Suspicious breast massMale breast cancer pathway. ScienceDirect1 Testosterone - an overview | ScienceDirect Topicsccjm[PDF] Gynecomastia - Cleveland Clinic Journal of MedicineMammography and biopsy. ScienceDirect1 Testosterone - an overview | ScienceDirect Topicsccjm[PDF] Gynecomastia - Cleveland Clinic Journal of Medicine

Management

How should treatment be matched to the etiologic branch and duration?

Remove reversible drivers first; observation is appropriate when symptoms and malignancy risk are low.

When a medication, supplement, estrogen-containing exposure, recreational substance, or anabolic-androgenic steroid is implicated, discontinue, replace, or stop the exposure when clinically feasible and reassess the breast examination and symptoms. Drug-induced gynecomastia may regress after withdrawal, but prolonged disease is less likely to resolve completely after fibrotic change develops. Wolters KluwerGynecomastia in adolescents : Current Opinion in PediatricsOxford AcademicAndrogen Misuse and Abuse | Endocrine Reviews - Oxford AcademicPubMedGynecomastia: Clinical evaluation and managementccjm[PDF] Gynecomastia - Cleveland Clinic Journal of Medicine

Treat identified systemic and endocrine causes rather than treating breast enlargement in isolation. Relevant branches include hypogonadism, thyrotoxicosis, renal or hepatic dysfunction, hyperprolactinemia, and testicular, adrenal, or other malignancy-associated hormone production. The diagnostic pattern should determine the referral and definitive therapy rather than a uniform antiestrogen strategy. ScienceDirect1 Testosterone - an overview | ScienceDirect Topicsccjm[PDF] Gynecomastia - Cleveland Clinic Journal of MedicinePubMed[Disordered hormone regulation in gynecomastia] - PubMed

For asymptomatic, long-standing adult gynecomastia without concerning findings, reassurance is appropriate. For new-onset disease, follow-up is reasonable because spontaneous regression occurs in adolescents and adults, whereas persistence beyond 1 year is associated with a low likelihood of complete regression. PubMedGynecomastia: Clinical evaluation and management

Do not combine anastrozole with tamoxifen: coadministration lowers anastrozole concentration and provided no efficacy benefit over tamoxifen in breast cancer trial data. Anastrozole has not demonstrated efficacy for pubertal gynecomastia and is not an established treatment for that indication. dailymed nlm nihHIGHLIGHTS OF PRESCRIBING INFORMATION These highlights do not include all the information needed to use anastrozole tablets safely and effectively. See full prescribing information for anastrozole tablets. Initial U.S. Approvaldailymed nlm nihhighlights of prescribing information - DailyMedaccessdata fda[PDF] Arimidex (anastrozole) tablet label - accessdata.fda.govaccessdata fda[PDF] 20541Orig1s023 - accessdata.fda.gov

Management by duration, impact, and cause. JAMAGynecomastia in Adolescent Boys - JAMA NetworkWolters KluwerGynecomastia in adolescents : Current Opinion in PediatricsOxford AcademicAndrogen Misuse and Abuse | Endocrine Reviews - Oxford AcademicPubMedGynecomastia: Clinical evaluation and managementccjm[PDF] Gynecomastia - Cleveland Clinic Journal of Medicine
SituationManagementEscalation trigger
Typical pubertal gynecomastia within 1 to 2 yearsReassurance, psychosocial assessment, and clinical follow-up; avoid hormones or surgery during this interval. JAMAGynecomastia in Adolescent Boys - JAMA NetworkWolters KluwerGynecomastia in adolescents : Current Opinion in PediatricsPersistence, progression, atypical timing, concerning examination, or significant distress. Wolters KluwerGynecomastia in adolescents : Current Opinion in PediatricsScienceDirect11-Ketotestosterone - an overview | ScienceDirect Topics
Identifiable drug, supplement, or anabolic steroid exposureStop, replace, or discontinue the implicated exposure when feasible. Wolters KluwerGynecomastia in adolescents : Current Opinion in PediatricsOxford AcademicAndrogen Misuse and Abuse | Endocrine Reviews - Oxford Academicccjm[PDF] Gynecomastia - Cleveland Clinic Journal of MedicinePersistent enlargement or pain after exposure removal, or abnormal examination/laboratory findings. PubMedGynecomastia: Clinical evaluation and managementccjm[PDF] Gynecomastia - Cleveland Clinic Journal of Medicine
Systemic/endocrine disorder or hormone-secreting tumor patternTreat the underlying disorder and complete directed imaging or specialty evaluation. Wolters KluwerMultidisciplinary Team Care: Adolescent BreastScienceDirect1 Testosterone - an overview | ScienceDirect Topicsccjm[PDF] Gynecomastia - Cleveland Clinic Journal of MedicineAbnormal beta-hCG, estradiol, gonadotropins, testicular examination, or suspicious breast findings. Wolters KluwerMultidisciplinary Team Care: Adolescent Breastccjm[PDF] Gynecomastia - Cleveland Clinic Journal of Medicine
Persistent disease for more than 12 months with substantial symptoms or psychosocial burdenDiscuss surgical management after cause evaluation. PubMedGynecomastia: Clinical evaluation and managementSuspected malignancy requires diagnostic tissue evaluation rather than elective cosmetic surgery. PubMedGynecomastia: Clinical evaluation and managementccjm[PDF] Gynecomastia - Cleveland Clinic Journal of Medicine

Adolescent gynecomastia

For physiologic pubertal gynecomastia, reassure, assess psychological distress, and follow clinically. Approximately 85% to 90% of pubertal cases regress between 6 months and 2 years; persistence after age 17 is uncommon. The reported median duration in one longitudinal cohort was 1.9 years. Wolters KluwerGynecomastia in adolescents : Current Opinion in PediatricsScienceDirect11-Ketotestosterone - an overview | ScienceDirect TopicsPubMedGynecomastia: Clinical evaluation and management

Order hormonal testing in adolescents when gynecomastia is excessive, prolonged, occurs outside midpuberty, or is accompanied by concerning examination findings or exposures. The suggested targeted evaluation includes testosterone, estradiol, hCG, LH, FSH, TSH, and DHEAS; additional studies may include prolactin, free thyroxine, inhibin B, and anti-Müllerian hormone when the clinical differential requires them. ScienceDirect11-Ketotestosterone - an overview | ScienceDirect Topics

Procedural care

When should gynecomastia surgery be considered?

Surgery is a definitive option after etiologic evaluation and when persistence or consequences outweigh operative tradeoffs.

Consider surgical treatment for long-standing gynecomastia, generally beyond 12 months, when there is considerable pain, psychological stress, cosmetic concern, or concern for malignancy. Subcutaneous mastectomy is the most commonly used operative technique for glandular tissue; technique selection depends on the relative fat, parenchyma, skin laxity, and severity of enlargement. PubMedGynecomastia: Clinical evaluation and management

In adolescents, defer elective surgery until the testes have reached adult size because breast tissue can regrow if surgery occurs before pubertal completion. Surgery may nevertheless be necessary for a suspicious lesion, in which case diagnostic priorities supersede cosmetic timing. PubMedGynecomastia: Clinical evaluation and management

Liposuction may be used with mammoplasty in men with gynecomastia when body contour and adipose contribution warrant it. In body-contouring data, reported overall liposuction complication rates were 2.4%, including 0.7% for liposuction alone and 3.5% when combined with other procedures; complications include ecchymosis, edema, infection, seroma, hematoma, and venous thromboembolism. These estimates are not specific to gynecomastia operations. ccjmLiposuction: Concepts, safety, and techniques in body-contouring surgery | Cleveland Clinic Journal of medicine

Surgical decision points in gynecomastia. PubMedGynecomastia: Clinical evaluation and managementccjmLiposuction: Concepts, safety, and techniques in body-contouring surgery | Cleveland Clinic Journal of medicine
Candidate featureProcedural implicationKey tradeoff
Persistent glandular gynecomastia with pain, distress, or cosmetic burdenSubcutaneous mastectomy is commonly used. PubMedGynecomastia: Clinical evaluation and managementLong-standing fibrotic tissue is less likely to regress spontaneously, supporting definitive treatment when symptoms are consequential. PubMedGynecomastia: Clinical evaluation and management
Significant adipose component requiring contouringLiposuction may be used in conjunction with mammoplasty. ccjmLiposuction: Concepts, safety, and techniques in body-contouring surgery | Cleveland Clinic Journal of medicineRisks include infection, seroma, hematoma, and venous thromboembolism. ccjmLiposuction: Concepts, safety, and techniques in body-contouring surgery | Cleveland Clinic Journal of medicine
Adolescent without completed pubertyUsually defer elective surgery until adult testicular size. PubMedGynecomastia: Clinical evaluation and managementEarlier surgery can be followed by regrowth of breast tissue. PubMedGynecomastia: Clinical evaluation and management
Suspicion for breast malignancyDiagnostic mammography and biopsy take precedence. ScienceDirect1 Testosterone - an overview | ScienceDirect Topicsccjm[PDF] Gynecomastia - Cleveland Clinic Journal of MedicineCosmetic operative planning should wait for tissue diagnosis.

References

  1. HIGHLIGHTS OF PRESCRIBING INFORMATION These highlights do not include all the information needed to use anastrozole tablets safely and effectively. See full prescribing information for anastrozole tablets. Initial U.S. Approvaldailymed.nlm.nih.gov · dailymed.nlm.nih.gov
  2. highlights of prescribing information - DailyMeddailymed.nlm.nih.gov · dailymed.nlm.nih.gov
  3. [PDF] Arimidex (anastrozole) tablet label - accessdata.fda.govwww.accessdata.fda.gov · www.accessdata.fda.gov
  4. [PDF] 20541Orig1s023 - accessdata.fda.govwww.accessdata.fda.gov · www.accessdata.fda.gov
  5. [PDF] Anastrozole Clinical Pediatric Review - FDAwww.fda.gov · www.fda.gov
  6. Gynecomastia in Adolescent Boys - JAMA Networkjamanetwork.com · jamanetwork.com
  7. Gynecomastia in adolescents : Current Opinion in Pediatricsjournals.lww.com · journals.lww.com
  8. Routine Endocrinologic Evaluation Is Unnecessary... - Ovidjournals.lww.com · journals.lww.com
  9. Gynecomastia : Indian Journal of Endocrinology and Metabolismjournals.lww.com · journals.lww.com
  10. Multidisciplinary Team Care: Adolescent Breastjournals.lww.com · journals.lww.com
  11. Gynecomastia - an overview | ScienceDirect Topicswww.sciencedirect.com · www.sciencedirect.com
  12. 1 Testosterone - an overview | ScienceDirect Topicswww.sciencedirect.com · www.sciencedirect.com
  13. Hyperestrogenism - an overview | ScienceDirect Topicswww.sciencedirect.com · www.sciencedirect.com
  14. 11-Ketotestosterone - an overview | ScienceDirect Topicswww.sciencedirect.com · www.sciencedirect.com
  15. Persistent Gynecomastia due to Short-term Low-dose Finasteride for ...academic.oup.com · academic.oup.com
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  21. [Disordered hormone regulation in gynecomastia] - PubMedwww.ncbi.nlm.nih.gov · www.ncbi.nlm.nih.gov
  22. Most Teens with Gynecomastia Don't Need Hormone Lab Tests | ASPSwww.plasticsurgery.org · www.plasticsurgery.org
  23. Liposuction: Concepts, safety, and techniques in body-contouring surgery | Cleveland Clinic Journal of medicinewww.ccjm.org · www.ccjm.org
  24. Clinical and Etiological Aspects of Gynecomastia in Adult Males: A Multicenter Study - PMCwww.ncbi.nlm.nih.gov · www.ncbi.nlm.nih.gov