Physiological neonatal breast enlargement
Citation, DOI & case data
Asymmetric left breast enlargement in an infant.
Loading Stack -
0 images remaining
There is unilateral (left-sided), asymmetric, heterogeneous, retroareolar tissue measuring 20.4 x 7.1 x 22.7 mm. There is no evidence of neonatal mastitis. There is normal age-appropriate contralateral right breast tissue.
Features consistent with unilateral, physiological, left breast enlargement in a 4-month-old child.
Conservative management was recommended.
Physiological neonatal breast enlargement is caused either by an exaggerated response to maternal estrogen that has entered the fetal circulation through the placenta or pituitary secretion of prolactin near the end of pregnancy as a response to declining estrogen levels in the maternal circulation. It is more frequently bilateral. Resolution is expected at 6 months of age, although it can take longer than that.
Sonographer: E Mbuyane