Breast - nonmalignant
Congenital anomalies
Amastia / aplasia / hypoplasia of breast tissue

Author: Hind Nassar, M.D. (see Authors page)

Revised: 17 August 2018, last major update July 2010

Copyright: (c) 2002-2018,, Inc.

PubMed Search: Breast amastia aplasia hypoplasia

Cite this page: Nassar, H. Amastia / aplasia / hypoplasia of breast tissue. website. Accessed December 17th, 2018.
Definition / general
  • Amastia: no glandular tissue (no breast bud), no nipple and no areola
  • Aplasia: nipple and areola present but no glandular tissue
  • Hypoplasia: small rudimentary breasts (i.e. breast underdevelopment); also called micromastia
  • Uncommon
  • Occurs more often in females than males
  • Unilateral or bilateral
Case reports
Clinical images

Images hosted on other servers:

Amastia in 11 year old girl

Hypoplasia in 9 year old girl
(fig 1)

Becker nevus with hypoplasia

Hypoplasia of right breast

26 year old woman:

Preoperative of bilateral amastia