Duct diameter was 1.9 ± 0.6 mm, 2.0 ± 90.7 mm and the number of main ducts was 9.6 ± 2.9, 9.2 ± 2.9, for left and right breast, respectively. All ducts branched within the areolar radius, the first branch occurring 8.0 ± 5.5 mm from the nipple. Ducts were easily compressed and did not display typical sinuses. Milk ducts appeared as hypoechoic tubular structures with echogenic walls that often contained echoes. The number of main ducts was measured, ductal morphology was determined, and the distribution of glandular and adipose tissue was recorded.
The breasts of 21 fully lactating women (1–6 months post partum) were scanned using an ACUSON XP10 (5–10 MHz linear array probe). The aim of this study was to use ultrasound imaging to re-investigate the anatomy of the lactating breast.
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