<unk>  can be congenital or acquired disorder and may be unilateral or bilateral. Congenital causes include ulnar–mammary syndrome (caused by mutations in the TBX3 gene), Poland syndrome, Turner syndrome, and congenital adrenal hyperplasia. There is also a case report of familial hypoplasia of the nipples and athelia associated with mammary hypoplasia that was described in a father and his daughters. Acquired causes of<unk>  include irradiation in infancy and childhood and surgical removal of prepubertal breast bud.
Micromastia
Synechia 
Microtia
Michel aplasia
Macrotia
Microdontia
Amastia
Cartilage–hair hypoplasia