Figure 4a. Acquired AVM in a 26-year-old woman. The patient had intermittent vaginal bleeding after D&C for a therapeutic abortion 9 weeks earlier. The serum ß-HCG test was negative at presentation. (a) Transverse gray-scale US image shows a thickened endometrium and myometrium with subtle inhomogeneity (arrows) in the left posterior aspect of the uterus. (b) Transverse color Doppler US image shows focally increased arterial vascularity in the corresponding area (arrows). (c) Transverse duplex Doppler US image shows arterial flow with a high diastolic component (PSV, 42 cm/sec; RI, 0.52). (d) Left internal iliac angiogram shows a markedly opacified vascular tangle (arrows) supplied by the left uterine artery (arrowhead). Follow-up Doppler US examinations after embolization with a 3-mm-diameter coil showed disappearance of the lesion.