Editing Benign breast lesions (section)

== Congenital abnormalities ==

* Accessory breast tissue or accessory nipples
** Failure of regression of the ectodermal ridge
** Accessory nipples most commonly seen below the breast and above the level of umbilicus. Rarely cause problems, often not even noticed. Can be excised if causing irritation.
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* Accessory tissue is usually seen in the axilla but occasionally below the breast. Often becomes more prominent during pregnancy and lactation. Can be excised, but the wounds and cosmesis can be challenging to manage.
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* Absence of tissue
** Can be associated with Poland's syndrome - a spectrum of conditions involving absence or hypoplasia of the pectoral muscle or breast, deformity of the underlying chest wall, and upper limb abnormalities. Rare, usually partial, more common in men.
** Amastia
*** Congenital absence of the breast
*** Due to complete regression of the ectodermal ridge
** Athelia
*** Congenital absence of the nipple
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* Asymmetry of breasts
** Common but usually mild, usually just requires reassurance
* Tubular breasts
** Usually small, widely-spaced breasts with a high infra-mammary fold, narrow breast base and large areola
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* Macromastia
** Defined as breast weight >2-3% of body weight
** Reduction mammoplasty after puberty - may recur if performed earlier

[[Category:Breast]]