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.
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 Kluwer+3Wolters 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. ScienceDirect+1ScienceDirect1 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 Kluwer+2Wolters KluwerGynecomastia in adolescents : Current Opinion in PediatricsPubMed[Disordered hormone regulation in gynecomastia] - PubMedplasticsurgeryMost Teens with Gynecomastia Don't Need Hormone Lab Tests | ASPS
Escalate promptly for a suspicious breast lesion or regional adenopathy: obtain mammography and tissue diagnosis. ScienceDirect+1ScienceDirect1 Testosterone - an overview | ScienceDirect Topicsccjm[PDF] Gynecomastia - Cleveland Clinic Journal of Medicine
Escalate for a palpable testicular lesion, testicular atrophy, or biochemical evidence of hCG/estradiol excess or gonadotropin abnormality: obtain testicular ultrasonography. Wolters Kluwer+1Wolters KluwerMultidisciplinary Team Care: Adolescent Breastccjm[PDF] Gynecomastia - Cleveland Clinic Journal of Medicine
Do not assume unilateral enlargement is malignant; unilateral and bilateral gynecomastia both occur, but physical findings determine whether breast cancer evaluation is necessary. PubMedPubMedClinical and Etiological Aspects of Gynecomastia in Adult Males: A Multicenter Study - PMC
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+1ccjm[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 Kluwer+1Wolters 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. ccjmccjm[PDF] Gynecomastia - Cleveland Clinic Journal of Medicine
Order karyotype testing when the examination or clinical context raises concern for Klinefelter syndrome. Wolters KluwerWolters KluwerMultidisciplinary Team Care: Adolescent Breast
If infertility is a major concern in a patient with suspected hypogonadism, include seminal fluid analysis in the reproductive assessment. ScienceDirectScienceDirect1 Testosterone - an overview | ScienceDirect Topics
In adolescents, routine endocrine panels have low yield: endocrine investigations provided no new clinical information in 99.4% of cases in one 197-patient series. plasticsurgeryplasticsurgeryMost Teens with Gynecomastia Don't Need Hormone Lab Tests | ASPS
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 Kluwer+3Wolters 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. ScienceDirect+2ScienceDirect1 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. PubMedPubMedGynecomastia: 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 nih+3dailymed 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
Document pain, tenderness, psychosocial impact, duration, and objective breast findings at reassessment; these determine whether continued observation remains acceptable or procedural treatment should be discussed. Wolters Kluwer+1Wolters KluwerGynecomastia in adolescents : Current Opinion in PediatricsPubMedGynecomastia: Clinical evaluation and management
Avoid treating typical pubertal gynecomastia with surgery or hormones during the first 1 to 2 years. JAMAJAMAGynecomastia in Adolescent Boys - JAMA Network
Counsel patients using anabolic-androgenic steroids that acne and gynecomastia are frequent adverse effects and that withdrawal effects can create cyclical dependency. Oxford AcademicOxford AcademicAndrogen Misuse and Abuse | Endocrine Reviews - Oxford Academic
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 Kluwer+2Wolters 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. ScienceDirectScienceDirect11-Ketotestosterone - an overview | ScienceDirect Topics
Assess testicular examination carefully; a testicular mass, atrophy, or incomplete/abnormal pubertal development shifts management from observation to endocrine or tumor-directed evaluation. Wolters Kluwer+2Wolters KluwerGynecomastia in adolescents : Current Opinion in PediatricsScienceDirect11-Ketotestosterone - an overview | ScienceDirect Topicsccjm[PDF] Gynecomastia - Cleveland Clinic Journal of Medicine
Address distress directly: psychological discomfort is common, and its severity may support referral for persistent disease even when the endocrine evaluation is unrevealing. Wolters Kluwer+1Wolters KluwerGynecomastia in adolescents : Current Opinion in PediatricsplasticsurgeryMost Teens with Gynecomastia Don't Need Hormone Lab Tests | ASPS
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. PubMedPubMedGynecomastia: 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. PubMedPubMedGynecomastia: 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. ccjmccjmLiposuction: Concepts, safety, and techniques in body-contouring surgery | Cleveland Clinic Journal of medicine
Before referral, document duration, glandular versus adipose distribution, skin excess, tenderness, psychological impact, prior exposure withdrawal, and completed evaluation for suspicious breast or testicular findings. PubMed+1PubMedGynecomastia: Clinical evaluation and managementccjm[PDF] Gynecomastia - Cleveland Clinic Journal of Medicine
Do not use elective surgery as a substitute for evaluation when malignancy is suspected; obtain mammography and biopsy. ScienceDirect+1ScienceDirect1 Testosterone - an overview | ScienceDirect Topicsccjm[PDF] Gynecomastia - Cleveland Clinic Journal of Medicine
| Candidate feature | Procedural implication | Key tradeoff |
|---|---|---|
| Persistent glandular gynecomastia with pain, distress, or cosmetic burden | Subcutaneous mastectomy is commonly used. PubMedPubMedGynecomastia: Clinical evaluation and management | Long-standing fibrotic tissue is less likely to regress spontaneously, supporting definitive treatment when symptoms are consequential. PubMedPubMedGynecomastia: Clinical evaluation and management |
| Significant adipose component requiring contouring | Liposuction may be used in conjunction with mammoplasty. ccjmccjmLiposuction: Concepts, safety, and techniques in body-contouring surgery | Cleveland Clinic Journal of medicine | Risks include infection, seroma, hematoma, and venous thromboembolism. ccjmccjmLiposuction: Concepts, safety, and techniques in body-contouring surgery | Cleveland Clinic Journal of medicine |
| Adolescent without completed puberty | Usually defer elective surgery until adult testicular size. PubMedPubMedGynecomastia: Clinical evaluation and management | Earlier surgery can be followed by regrowth of breast tissue. PubMedPubMedGynecomastia: Clinical evaluation and management |
| Suspicion for breast malignancy | Diagnostic mammography and biopsy take precedence. ScienceDirect+1ScienceDirect1 Testosterone - an overview | ScienceDirect Topicsccjm[PDF] Gynecomastia - Cleveland Clinic Journal of Medicine | Cosmetic operative planning should wait for tissue diagnosis. |
References
- 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. Approval — dailymed.nlm.nih.gov · dailymed.nlm.nih.gov
- highlights of prescribing information - DailyMed — dailymed.nlm.nih.gov · dailymed.nlm.nih.gov
- [PDF] Arimidex (anastrozole) tablet label - accessdata.fda.gov — www.accessdata.fda.gov · www.accessdata.fda.gov
- [PDF] 20541Orig1s023 - accessdata.fda.gov — www.accessdata.fda.gov · www.accessdata.fda.gov
- [PDF] Anastrozole Clinical Pediatric Review - FDA — www.fda.gov · www.fda.gov
- Gynecomastia in Adolescent Boys - JAMA Network — jamanetwork.com · jamanetwork.com
- Gynecomastia in adolescents : Current Opinion in Pediatrics — journals.lww.com · journals.lww.com
- Routine Endocrinologic Evaluation Is Unnecessary... - Ovid — journals.lww.com · journals.lww.com
- Gynecomastia : Indian Journal of Endocrinology and Metabolism — journals.lww.com · journals.lww.com
- Multidisciplinary Team Care: Adolescent Breast — journals.lww.com · journals.lww.com
- Gynecomastia - an overview | ScienceDirect Topics — www.sciencedirect.com · www.sciencedirect.com
- 1 Testosterone - an overview | ScienceDirect Topics — www.sciencedirect.com · www.sciencedirect.com
- Hyperestrogenism - an overview | ScienceDirect Topics — www.sciencedirect.com · www.sciencedirect.com
- 11-Ketotestosterone - an overview | ScienceDirect Topics — www.sciencedirect.com · www.sciencedirect.com
- Persistent Gynecomastia due to Short-term Low-dose Finasteride for ... — academic.oup.com · academic.oup.com
- Androgen Misuse and Abuse | Endocrine Reviews - Oxford Academic — academic.oup.com · academic.oup.com
- Effects of Gynecomastia Surgery on Readiness and Return to Duty ... — academic.oup.com · academic.oup.com
- Male hypogonadism: recommendations from the Fifth International ... — academic.oup.com · academic.oup.com
- Gynecomastia: Clinical evaluation and management — pmc.ncbi.nlm.nih.gov · pmc.ncbi.nlm.nih.gov
- [PDF] Gynecomastia - Cleveland Clinic Journal of Medicine — www.ccjm.org · www.ccjm.org
- [Disordered hormone regulation in gynecomastia] - PubMed — www.ncbi.nlm.nih.gov · www.ncbi.nlm.nih.gov
- Most Teens with Gynecomastia Don't Need Hormone Lab Tests | ASPS — www.plasticsurgery.org · www.plasticsurgery.org
- Liposuction: Concepts, safety, and techniques in body-contouring surgery | Cleveland Clinic Journal of medicine — www.ccjm.org · www.ccjm.org
- Clinical and Etiological Aspects of Gynecomastia in Adult Males: A Multicenter Study - PMC — www.ncbi.nlm.nih.gov · www.ncbi.nlm.nih.gov