Reviewer: Nat Pernick, M.D. (see Reviewers page)
Revised: 12 August 2013, last major update March 2010
Copyright: (c) 2002-2013, PathologyOutlines.com, Inc.
- Identical in males and females at birth
- Nipple is small pit in center of thickened areola, becomes everted shortly after birth due to proliferation of mesenchyme underlying the areola
- Breast enlargement (uni- or bilateral) is present in up to 70% of neonates due to neonatal prolactin production, caused by falling levels of maternal estrogens; associated with production of "witch’s milk" in males and females
- Continued breast stimulation (squeezing or massaging breasts) may cause hypersecretory state to persist
- Milk secretion: resembles colostrum; contains water, fat and cellular debris
- Duct dilation without acini
AFIP Fig 1: neonatal breast ectasia with dilation of mammary ducts
End of Breast-nonmalignant > General > Neonatal breast
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