Figure 4From: The use of ultrasound to identify milk ejection in women – tips and pitfallsUltrasound image of the main milk duct in a lactating woman. The milk ducts are displayed on ultrasound as hypoechoic (black) branching structures. The measured main milk duct is barely imperceptible with a diameter of 0.4 mm (a). The merging milk ducts measured 0.8 mm (b) and 0.75 mm (c).Back to article page