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Joseph Junewick, MD FACR
over 11 years ago
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Unilateral Infantile Breast Stimulation

Case Detail

Anatomy: Breast
Joseph Junewick, MD FACR
Diagnostic Category: Developmental or Congenital
Created: over 10 years ago
Updated: over 9 years ago
Tags: PEDS
Modality/Study Types: US
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2 month old breastfed female with right breast mass.

Case Images


Unilateral Infantile Breast Stimulation


US – Asymmetric glandular tissue with prominent ducts; no mass or abnormal vascularity.


In prepubertal children, the breasts are composed of epithelial-lined ducts surrounded by a connective tissue stroma. Estrogen crosses the placenta late in pregnancy and also into breast milk resulting in stimulation of fetal/infant breast tissue. Subareolar ducts are often enlarged at birth in both male and female full-term infants and palpable nodules commonly persist for the first 6–12 months of life. Asymmetric involvement is likely related to locally different tissue receptor sensitivity.


Chung EM, Cube R, Hall GJ et al. Breast masses in children and adolescents: Radiologic-pathologic correlation. RadioGraphics (2009); 29: 907-931.

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