Thrombus in a liver vein in a cow with vascular hamartoma of the liver. Ultrasonogram of the liver of a six-year-old Swiss Braunvieh cow with a vascular hamartoma of the liver. Many dilated liver veins and an echogenic thrombus, in what is likely the right hepatic vein, are evident. The image was obtained from the 11th intercostal space using a 5.0 MHz convex transducer. 1 Lateral abdominal wall, 2 Liver, 3 Caudal vena cava, 4 Dilated liver veins, 5 Echogenic thrombus, Ds Dorsal, Vt Ventral.