Supernumerary Nipple

Back

Background

Supernumerary nipples are common minor congenital malformations that consist of nipples and/or related tissue in addition to the nipples normally appearing on the chest. Supernumerary nipples are located along the embryonic milk lines. Ectopic supernumerary nipples are found beyond the embryonic milk lines. The embryonic milk line is the line of potentially appearing breast tissue as observed in many mammals. In humans, the embryonic milk line extends bilaterally from a point slightly beyond the axillae on the arms, down the chest and the abdomen toward the groin. It is generally thought to end at the proximal inner sides of the thighs, although supernumerary nipples have been described on the foot.[1] Supernumerary nipples can appear complete with breast tissue and ducts and are then referred to as polymastia, or they can appear partially with either of the tissues involved.

The classification established by Kajava in 1915 remains valid[2] :

Although this classification is clear, encountering interchangeable terms and misnomers when dealing with the supernumerary nipple complex is not surprising due to variability in morphologic patterns.

The paucity of descriptions of supernumerary nipples in medical writings is probably due to its relatively minor clinical significance. The occurrence of supernumerary nipples has been documented since Roman times and featured in legends and ethnic mythology prior to that time. Supernumerary nipples, and particularly polymastia, were attributed to increased femininity and fertility. Ancient artists depicted the goddess of Artemis of Ephesus and the Phoenician goddess of fertility, Astrate, like other ancient deities, as having row upon row of breasts on their chests.[3] Anne Boleyn, the wife of King Henry VIII, was known to have a third breast. Supernumerary nipples in men were a sign of virility and endowed them with divine powers. Nowadays, film stars expose their supernumerary nipples in the cinema with this same effect.[3]

The first medical report dates back to 1878 when Leichtenstern estimated the prevalence of supernumerary nipples to be 1 in 500 (0.2%).[4] In recent years, supernumerary nipples and their association with other congenital anomalies and malignancies has been a topic of considerable debate.

Associations with other diseases

Supernumerary nipple features are found in a number of syndromes, but, in most cases, it is probably a chance finding. These syndromes include Turner syndrome, Fanconi anemia, and other hematologic disorders[5] ; ectodermal dysplasia; Kaufman-McKusick syndrome; Char syndrome; Simpson-Golabi-Behmel syndrome; and epibulbar lipodermoids associated with preauricular appendages syndrome.[6] Isolated reports have linked supernumerary nipples to a number of other conditions, but in light of the fact that supernumerary nipples occur with a relatively high frequency in the general population, further studies are needed to validate the following associations:

Central nervous system associations are as follows:

Gastrointestinal associations are as follows:

Ears, nose, throat, and lung associations are as follows:

Skeletal associations are as follows:

Cardiac associations are as follows:

Publications concerning renal and urinary tract involvement in the presence of supernumerary nipple

In 1979, Méhes drew attention to the association of supernumerary nipples and other anomalies.[7] The claim that 40% of supernumerary nipples investigated also had renal involvement was striking. This figure was later corrected to 23-27%[8, 9] ; however, more recent studies have not validated this association. In addition to renal and urinary tract malformations, supernumerary nipples have also been reported in association with solid organ malignancies such as renal adenocarcinoma, testicular cancer, prostate cancer, and urinary bladder carcinoma.

Claiming close association are as follows:

Denying support for association are as follows:

The Medscape article Disorders of the Breast may be of interest.

Pathophysiology

Saint-Hilaire in 1836 and Darwin in 1871 supported the notion that the supernumerary nipple is an atavistic structure derived from the milk line of mammals. Conceivably, even the ectopic supernumerary nipple falls in line with Darwin's theory of atavism. Supernumerary nipples on the vulva are consistent with the location of breasts in dolphins and whales; whereas, ectopic supernumerary nipples on the back, scapula, and shoulder[32, 33, 34] are reminiscent of breast tissue in nutria and hutia (rodents).

Between the fourth and fifth weeks of embryogenesis, an ectodermal thickening forms symmetrically along the ventral lateral sides of the embryo. This epidermal ridge extends from the axillary region to the inner side of the thigh to form the embryogenic milk (or mammary) line. During the second and third months of embryonic development, the glandular elements of the breast are formed near the fourth and fifth ribs, with regression of the rest of the thickened ectodermal streaks. In the case of failure of a complete regression, some foci may remain, resulting in a supernumerary nipple. This can develop into a supernumerary complete breast (polymastia) or into any other supernumerary nipple variant according to the Kajava classification.

Etiology

Most supernumerary nipples are sporadic, although familial cases have been reported, including 1 report of a family who had supernumerary nipples in 4 successive generations. Familial cases are typically inherited in an autosomal dominant fashion with incomplete expressivity.[35]

Epidemiology

Frequency

The prevalence of supernumerary nipples varies geographically. The prevalence is 0.22% in a Hungarian population,[6] 1.63% in African American neonates,[20] 2.5% in Israeli neonates,[21] 4.7% in Israeli Arabic children,[36] and 5.6% in German children.[29]

Sex

The incidence of supernumerary nipples is similar in males and females. Some studies have supported a slight male predominance with estimates of male-to-female ratio as high as 1.7:1.

Prognosis

Most isolated supernumerary nipples persist without complication. Ectopic breast tissue can be associated with the same inflammatory and neoplastic conditions that affect normal breast tissue. Ectopic breast tissue does not have an increased malignant potential compared with normal breast tissue.

Patient Education

Once a supernumerary nipple is diagnosed, inform the parents or the patient that it is a benign skin lesion in an otherwise healthy individual. Patients should be made aware that supernumerary nipples can go through changes like any regular nipple or breast; these changes may be physiological during puberty or pathological, such as inflammation, mastitis, abscess formation, cysts, adenomata, fibroadenoma, carcinoma, melanoma, or Paget disease.

History

The supernumerary nipple typically remains asymptomatic and undetected. Occasionally, the supernumerary nipple becomes apparent during puberty, menstruation, or pregnancy when hormonal changes result in increased pigmentation, swelling, tenderness, or even lactation.

Physical Examination

The supernumerary nipple is often overlooked at the first examination of the neonate. It appears as a small pigmented or pearl-colored mark or as a concave or umbilicated lesion.



View Image

Supernumerary nipple in a neonate. Courtesy of Dr P. Merlob.

In 75% of patients, it measures no more than 30% of the diameter of the normal nipple (at times no more than 0.2-0.3 cm in diameter). In the other 25% of patients, it is as large as 50% of the normal size of the nipple. Rarely, a supernumerary nipple is as large as a normal nipple.[30]



View Image

Supernumerary nipple in an adolescent boy. Courtesy of Dr B. Fisher.

Most supernumerary nipples are single. Multiple supernumerary nipples may be present and as many as 8 have been reported in the same individual. When multiple supernumerary nipples are present, they may be distributed bilaterally or unilaterally, symmetrically or asymmetrically. Most supernumerary nipples are located inferior to the normal nipple, while approximately 13% appear above it along the milk line.[22]

When examining adolescent girls (note the image below), the normally developed breast may hide the supernumerary nipple. A number of studies have indicated a preponderance of supernumerary nipples on the right side.[27]



View Image

Supernumerary nipple (bilateral) in an adolescent girl.

For easier detection of the supernumerary nipple, a wet gauze pad is passed along the mammary line (milk line) from the axillary region to the upper part of the thigh on each side. This technique is particularly helpful in the dry and desquamating skin of full-term and postterm infants.[22] When the suggested lesion is concave, folding it between fingers shows a typical wrinkling.

A dermoscopic examination of supernumerary nipple shows a pattern similar to the dermatofibroma with a central, white, scarlike area and a peripheral fine-pigment network. The supernumerary nipple may also present with a cleftlike appearance centrally in the absence of lateral pressure, thus allowing differentiation from dermatofibroma.[37] For a more precise examination one can resort to a reflectance confocal microscopy.[38]

Approximately 5% of supernumerary nipples are identified in ectopic locations outside of the milk line, such as on the back,[34] shoulder (note the image below),[39] extremities, neck, face, genitalia, and perineum.



View Image

Ectopic supernumerary nipple on the shoulder. Courtesy of Dr B. Fisher.

Histologic Findings

The histologic features of a supernumerary nipple are identical to that of the regular nipple, including hyperpigmentation, slight hyperkeratosis with epidermal thickening, pilosebaceous structure of Montgomery areolar tubercles, smooth muscle bundles typical of the areola, and possible mammary glands and intradermal straight ducts.[40] A significant increase in the number of clear cells of Toker has been found in supernumerary nipple tissue, and some authors have proposed that the supernumerary nipple may be a precursor of extramammary Paget disease.[41]

Surgical Care

Cosmetically undesirable or symptomatic supernumerary nipples should be removed with complete surgical excision, although the use of liquid nitrogen cryotherapy has been described.[42] The removal of polymastia or a complete ectopic supernumerary nipple (with breast) is more involved but is indicated in women at high risk of developing breast cancer.[43] To avoid an unsightly scar after the removal of a complete ectopic supernumerary nipple, the tumescent liposuction technique has been suggested.[44, 45]

The Medscape Dermatologic Surgery Resource Center may be of interest.

Consultations

The presence of a sporadic supernumerary nipple in an otherwise healthy individual is typically not an indication for a thorough workup for other malformations. Exceptions are a supernumerary nipple accompanied by additional minor malformations, a prominent ectopic supernumerary nipple, or an established familial supernumerary nipple. Physical examination and mammography of ectopic breast tissue should occur at the frequency recommended for normal breast tissue in a particular patient.

Author

Nicholas V Nguyen, MD, Director of Pediatric Dermatology, Akron Children's Hospital

Disclosure: Nothing to disclose.

Coauthor(s)

Craig G Burkhart, MD, MPH, Clinical Professor, Department of Medicine, Medical College of Ohio; Clinical Assistant Professor, Department of Medicine, Ohio University College of Osteopathic Medicine

Disclosure: Nothing to disclose.

Specialty Editors

Michael J Wells, MD, FAAD, Dermatologic/Mohs Surgeon, The Surgery Center at Plano Dermatology

Disclosure: Nothing to disclose.

Robert A Schwartz, MD, MPH, Professor and Head of Dermatology, Professor of Pathology, Professor of Pediatrics, Professor of Medicine, Rutgers New Jersey Medical School

Disclosure: Nothing to disclose.

Chief Editor

Dirk M Elston, MD, Professor and Chairman, Department of Dermatology and Dermatologic Surgery, Medical University of South Carolina College of Medicine

Disclosure: Nothing to disclose.

Acknowledgements

Mark A Crowe, MD Assistant Clinical Instructor, Department of Medicine, Division of Dermatology, University of Washington School of Medicine

Mark A Crowe, MD is a member of the following medical societies: American Academy of Dermatology and North American Clinical Dermatologic Society

Disclosure: Nothing to disclose.

Aryeh Metzker, MD Consulting Staff, Department of Pediatric Dermatology, Senior Clinical Lecturer, Department of Dermatology, Sourasky Medical Center, Sackler School of Medicine, Tel Aviv University

Disclosure: Nothing to disclose.

References

  1. Conde DM, Kashimoto E, Torresan RZ, Alvarenga M. Pseudomamma on the foot: an unusual presentation of supernumerary breast tissue. Dermatol Online J. 2006 May 30. 12(4):7. [View Abstract]
  2. De Cholnoky T. Supernumerary breast. Arch Surg. 1939. 39:926-41.
  3. Grossl NA. Supernumerary breast tissue: historical perspectives and clinical features. South Med J. 2000 Jan. 93(1):29-32. [View Abstract]
  4. Leichtenstern D. Uber das Vorkommen und Bedeutung Supernumerarer (accessorischer ) Bruste und Brustwarzen. Arch Pathol Anat Physiol Klin Med. 1878. 73:222.
  5. Aslan D, Gürsel T, Kaya Z. Supernumerary nipples in children with hematologic disorders. Pediatr Hematol Oncol. 2004 Jul-Aug. 21(5):461-3. [View Abstract]
  6. Goldschmidt E, Jacobsen N. Epibulbar lipodermoids, preauricular appendages and polythelia in four generations: a new hereditary syndrome?. Ophthalmic Genet. 2010 Jun. 31(2):81-3. [View Abstract]
  7. Méhes K. Association of supernumerary nipples with other anomalies. J Pediatr. 1979 Aug. 95(2):274-5. [View Abstract]
  8. Mehes K. Association of supernumerary nipples with other anomalies. J Pediatr. 1983 Jan. 102(1):161. [View Abstract]
  9. Varsano IB, Jaber L, Garty BZ, Mukamel MM, Grünebaum M. Urinary tract abnormalities in children with supernumerary nipples. Pediatrics. 1984 Jan. 73(1):103-5. [View Abstract]
  10. Goedert JJ, McKeen EA, Fraumeni JF Jr. Polymastia and renal adenocarcinoma. Ann Intern Med. 1981 Aug. 95(2):182-4. [View Abstract]
  11. Kahn SA, Wagner RF Jr. Polythelia and unilateral renal agenesis. Cutis. 1982 Aug. 30(2):225-6. [View Abstract]
  12. Meggyessy V, Mehes K. Association of supernumerary nipples with renal anomalies. J Pediatr. 1987 Sep. 111(3):412-3. [View Abstract]
  13. Hersh JH, Bloom AS, Cromer AO, Harrison HL, Weisskopf B. Does a supernumerary nipple/renal field defect exist?. Am J Dis Child. 1987 Sep. 141(9):989-91. [View Abstract]
  14. Mehes K, Pinter A. Minor morphological aberrations in children with isolated urinary tract malformations. Eur J Pediatr. 1990 Mar. 149(6):399-402. [View Abstract]
  15. Leung AK, Robson WL. Renal anomalies in familial polythelia. Am J Dis Child. 1990 Jun. 144(6):619-20. [View Abstract]
  16. Urbani CE, Betti R. Accessory mammary tissue associated with congenital and hereditary nephrourinary malformations. Int J Dermatol. 1996 May. 35(5):349-52. [View Abstract]
  17. Brown J, Schwartz RA. Supernumerary nipples and renal malformations: a family study. J Cutan Med Surg. 2004 May-Jun. 8(3):170-2. [View Abstract]
  18. Ferrara P, Giorgio V, Vitelli O, Gatto A, Romano V, Bufalo FD, et al. Polythelia still a marker of urinary trct anomalies in children. Scand J Urol Nephrol. 2009. 43(1):47-50.
  19. Grimshaw EC, Cohen PR. Supernumerary nipple and seminoma: case report and review of polythelia and genitourinary cancers. Dermatol Online J. 2013 Jan 15. 19(1):4. [View Abstract]
  20. Smith DW. Comment on association of supernumerary nipples with other anomalies. Oska FA, Stockman JA III, eds. Year Book of Pediatrics. Chicago, Ill: YB Medical Publishers; 1981. 437.
  21. Rahbar F. Clinical significance of supernumerary nipples in black neonates. Clin Pediatr (Phila). 1982 Jan. 21(1):46-7. [View Abstract]
  22. Mimouni F, Merlob P, Reisner SH. Occurrence of supernumerary nipples in newborns. Am J Dis Child. 1983 Oct. 137(10):952-3. [View Abstract]
  23. Robertson A, Sale P, Sathyanarayan. Lack of association of supernumerary nipples with renal anomalies in black infants. J Pediatr. 1986 Sep. 109(3):502-3. [View Abstract]
  24. Kenney RD, Flippo JL, Black EB. Supernumerary nipples and renal anomalies in neonates. Am J Dis Child. 1987 Sep. 141(9):987-8. [View Abstract]
  25. Hoyme HE. Minor malformations. Significant or insignificant?. Am J Dis Child. 1987 Sep. 141(9):947. [View Abstract]
  26. Bortz J, Parker S, Ray TL. Lack of associated renal anomalies in familial polythelia. Am J Dis Child. 1989 Aug. 143(8):883. [View Abstract]
  27. Armoni M, Filk D, Schlesinger M, Pollak S, Metzker A. Accessory nipples: any relationship to urinary tract malformation?. Pediatr Dermatol. 1992 Sep. 9(3):239-40. [View Abstract]
  28. Jojart G, Seres E. Supernumerary nipples and renal anomalies. Int Urol Nephrol. 1994. 26(2):141-4. [View Abstract]
  29. Casey HD, Chasan PE, Chick LR. Familial polythelia without associated anomalies. Ann Plast Surg. 1996 Jan. 36(1):101-4. [View Abstract]
  30. Schmidt H. Supernumerary nipples: prevalence, size, sex and side predilection -- a prospective clinical study. Eur J Pediatr. 1998 Oct. 157(10):821-3. [View Abstract]
  31. Grotto I, Browner-Elhanan K, Mimouni D, Varsano I, Cohen HA, Mimouni M. Occurrence of supernumerary nipples in children with kidney and urinary tract malformations. Pediatr Dermatol. 2001 Jul-Aug. 18(4):291-4. [View Abstract]
  32. Newman M. Supernumerary nipples. Am Fam Physician. 1988 Aug. 38(2):183-8. [View Abstract]
  33. Baruchin A, Rosenberg L. A supernumerary nipple in a rare site. Report of a case. J Dermatol Surg Oncol. 1981 Nov. 7(11):918-9. [View Abstract]
  34. Hanson E, Segovia J. Dorsal supernumerary breast. Case report. Plast Reconstr Surg. 1978 Mar. 61(3):441-5. [View Abstract]
  35. Toumbis-Ioannou E, Cohen PR. Familial polythelia. J Am Acad Dermatol. 1994 Apr. 30(4):667-8. [View Abstract]
  36. Jaber L, Merlob P. The prevalence of supernumerary nipples in Arab infants and children. Eur J Pediatr. 1988 May. 147(4):443. [View Abstract]
  37. Oztas MO, Gurer MA. Dermoscopic features of accessory nipples. Int J Dermatol. 2007 Oct. 46(10):1067-8. [View Abstract]
  38. Kanitakis J. In vivo reflectance confocal microscopy of supernumerary nipple and differential diagnosis from melanocytic lesions. J Cutan Pathol. 2010 Jul. 37(7):797-801. [View Abstract]
  39. Schewach-Millet M, Fisher BK. Supernumerary nipple on the shoulder. Cutis. 1976 Feb. 17(2):384-5. [View Abstract]
  40. Shewmake SW, Izuno GT. Supernumerary areolae. Arch Dermatol. 1977 Jun. 113(6):823-5. [View Abstract]
  41. Willman JH, Golitz LE, Fitzpatrick JE. Clear cells of Toker in accessory nipples. J Cutan Pathol. 2003 Apr. 30(4):256-60. [View Abstract]
  42. Sladden MJ, Sladden JA. A novel treatment for accessory nipples. Br J Dermatol. 2008 Feb. 158(2):405. [View Abstract]
  43. Madej B, Balak B, Winkler I, Burdan F. Cancer of the accessory breast--a case report. Adv Med Sci. 2009. 54(2):308-10. [View Abstract]
  44. Fan J. Removal of accessory breasts: a novel tumescent liposuction approach. Aesthetic Plast Surg. 2009 Nov. 33(6):809-13. [View Abstract]
  45. Cinpolat A, Bektas G, Seyhan T, Ozad U, Coskunfirat OK. Treatment of a supernumerary large breast with medial pedicle reduction mammaplasty. Aesthetic Plast Surg. 2013 Aug. 37(4):762-6. [View Abstract]

Supernumerary nipple in a neonate. Courtesy of Dr P. Merlob.

Supernumerary nipple in an adolescent boy. Courtesy of Dr B. Fisher.

Supernumerary nipple (bilateral) in an adolescent girl.

Ectopic supernumerary nipple on the shoulder. Courtesy of Dr B. Fisher.

Supernumerary nipple in a neonate. Courtesy of Dr P. Merlob.

Supernumerary nipple (bilateral) in an adolescent girl.

Supernumerary nipple in an adolescent boy. Courtesy of Dr B. Fisher.

Ectopic supernumerary nipple on the shoulder. Courtesy of Dr B. Fisher.