Rare breast malformation

Rare breast malformation (Orphanet code 180163) is a broad category encompassing uncommon congenital or developmental anomalies of the breast tissue. These malformations affect the mammary gland and surrounding structures and can manifest in a variety of ways, including amastia (complete absence of the breast), athelia (absence of the nipple), polymastia (supernumerary or accessory breasts), polythelia (supernumerary nipples), breast hypoplasia (underdevelopment), breast hyperplasia, tuberous breast deformity, and other structural anomalies. These conditions may occur as isolated findings or as part of broader syndromic presentations involving the chest wall, limbs, or other organ systems. Breast malformations are typically apparent at birth or become noticeable during puberty when breast development normally occurs. They can affect one or both breasts and may range from mild cosmetic concerns to significant functional impairment, including difficulties with breastfeeding. Psychosocial impact, particularly during adolescence, can be considerable. Some forms, such as Poland syndrome-associated breast anomalies, are associated with ipsilateral chest wall and upper limb defects. Treatment is primarily surgical and is tailored to the specific type and severity of the malformation. Options include reconstructive surgery, breast augmentation or reduction, nipple reconstruction, and removal of accessory breast tissue. Timing of intervention is individualized, often deferred until after puberty when breast development is complete. Multidisciplinary care involving plastic surgeons, endocrinologists, and psychologists may be beneficial. There are currently no pharmacological treatments that correct the underlying structural anomalies.

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