<unk>  can be either iatrogenic or congenital. The congenital<unk>  are further divided into syndromic type and non-syndromic type respectively. As the definition suggests, syndromic<unk>  is often associated with obvious symptoms. The common case is hypoplasia of ectodermal tissue, such as hair and skin defects. On the other hand, non-syndromic<unk> , shows no defects in body parts other than breast. This type of<unk>  can be further classified into unilateral and bilateral<unk> . Unilateral<unk>  can be defined as<unk>  involving only one side of breast, while bilateral type refers to<unk>  on both sides of breast. Unilateral<unk>  is less common than bilateral<unk> . Almost all the non-syndromic<unk>  patients are female.
Amastia
Hamartia 
Macrodontia 
Macrotia
Acrania
Spotted lunulae
Cystic eyeball
Auricular hypertrichosis