Figure 7From: The use of ultrasound to identify milk ejection in women – tips and pitfallsUltrasound image of a milk ducts in the human lactating breast at milk ejection. Two main milk ducts are displayed on ultrasound as a hypoechoic (black) structure with echogenic walls (white). Duct 1 is more superficial and has increased from 1.95 mm to 3.44 mm in diameter. Duct 2 has increased from 3.72 mm to 6.24 mm.Back to article page