Ultrasonogram of the omasum. Ultrasonogram of the omasum and liver of a 5-year-old Saanen goat viewed from the 9th intercostal space with a 5.0-MHz convex transducer. The omasum appears as a curved echogenic line medial to the liver. 1 Abdominal wall, 2 Liver, 3 Omasum, 4 Portal vein, Ds Dorsal, Vt Ventral.