Fig. 2
A DFSP with three nodules in the right face of a 48-year-old man. B Transverse ultrasonogram revealing an ill-defined, hypoechoic with finger-like projections and posterior hyperechoic area, heterogeneous, and subcutaneous lesion extending from the skin to bone. C Color Doppler ultrasonogram revealing intralesional and peripheral vascularity and rich vascularization with vascular densities reaching 4.5/cm2. D Power Doppler ultrasound revealed artery with peak systolic blood flow velocity of 47.0 cm/s and resistance index of 0.57. E Elastography showing an elasticity score of 3. F Contrast-enhanced ultrasound revealed the trend that contrast agent enters (the 26th second after the injection of contrast agent) the lesion from the bottom to the center. G Contrast-enhanced ultrasound revealed heterogeneous hyper-enhancement at peak (the 50th second after the injection of contrast agent), with the maximum diameter and depth of 4.3 cm and 2.1 cm respectively