Ultrasonogram in a calf with diffuse peritonitis. Abdominal ultrasonogram of a 5-month-old calf with diffuse peritonitis as a result of a perforated abomasal ulcer. The image was obtained from the right flank using a 5-MHz convex transducer. The abdomen contains a large amount of fluid and fibrin septa. The small intestines are contained within the omental bursa. 1 Abdominal wall, 2 Abdominal fluid, 3 Fibrin strands, 4 Thickened greater omentum, 5 Small intestines, Ds Dorsal, Vt Ventral