Fig. 2

Color Doppler (top) and grayscale (bottom) ultrasound images of the five blood flow patterns. A avascular pattern showing no significant blood flow around or within the lesion. B dot-line pattern showing spot and short rod vessels around or inside the lesion. C branching pattern showing long blood vessels (indicated by white arrows), nearly or exceeding the lesion’s radius, and extending the lesion in a radial arrangement. D garland pattern showing red and blue blood flow signals concentrated around the focal area, with no central blood flow. E rich-disorganized pattern showing dense red and blue blood flow signals visible, with disordered intratumoral vessels connected