Fig. 4
A DFSP with atrophic plague in the left thigh of a 40-year-old woman. B Transverse ultrasonogram revealing an ill-defined, inverted triangle hyperechoic subcutaneous with hypoechoic area in the sunken dermis, heterogeneous, and subcutaneous lesion. C Color Doppler ultrasonogram revealing intralesional vascularity and poor vascularization with vascular densities reaching 1.0/cm2. D Elastography showing an elasticity score of 4. E Contrast-enhanced ultrasound revealed the trend that contrast agent enters (the 5th second after the injection of contrast agent) the lesion from the bottom to the center. F Contrast-enhanced ultrasound revealed heterogeneous hyper-enhancement at peak (the 45th second after the injection of contrast agent), with the maximum diameter and depth of 2.15 cm and 1.1 cm respectively. G The hyperechoic area correlated with a honeycomb invasive pattern in the subcutaneous tissue on histology (hematoxylin-eosin × 40)