Fig. 6. Venous malformation in 9-year old boy presented with mass in hand.
US (A) shows inter-/intra-muscular lesion containing anechoic serpentine structure (arrows) with increased internal echogenicity due to slow blood flow. There is focal hyperechoic lesion with posterior acoustic shadowing, suggesting phlebolith (arrowhead). Color Doppler scan (B) shows venous flow.