Encapsulated collection located in the subcutaneous tissue at the root of the right thigh (anterior). Well-defined heterogeneous hypoechoic presenting content, intermingled with echogenic beams, suggestive of hematic content (hematoma). For the most part is not identified internal flow on Doppler. In short segment in the set is identified turbulent flow (bidirectional flow), and it is coming through the femoral artery fistula. Note the characteristic yin-yang (red-blue) flow. Normal flow in the right femoral artery.