Figure 2. (a) Lack of flow within the portal vein is confirmed on ultrasound, with no flow on the spectral Doppler trace. Colour Doppler signal is seen in the portal collaterals. (b) This grey scale image shows echogenic material within the portal vein (black arrow), which is similar in appearance to that seen in the pseudocyst (white arrow). Sludge is seen layering in the gallbladder.