RT Book, Section
A1 Wells, Robert G.
SR Print(0)
ID 1148942426
T1 The Breast
T2 Diagnostic Imaging of Infants and Children
YR 2015
FD 2015
PB McGraw-Hill Education
PP New York, NY
SN 9780071808392
LK accesspediatrics.mhmedical.com/content.aspx?aid=1148942426
RD 2024/04/19
AB Paired  ectodermal  primitive  mammary  streaks  (milk  streaks)  form  along  the  ventral  surface  of  the  embryo  during  the  fifth  week  of  gestation.  These  extend  from  the  axilla  to  the  inguinal  region.  The  mammary  ridges  arise  in  the  thorax  from  these  streaks  and  there  is  progressive  differentiation  into  breast  parenchyma  during  fetal  development.  The  other  portions  of  the  mammary  streaks  normally  regress;  incomplete  involution  of  embryonic  breast  tissue  can  result  in  accessory  or  ectopic  breast  tissue  anywhere  along  the  primitive  mammary  streaks.