Ultrasonogram of the abdomen in a cow with uroperitoneum. Ultrasonogram of the abdomen obtained from the right flank using a 5.0-MHz convex transducer in a 3.1-year-old Braunvieh x Brown Swiss cow with uroperitoneum caused by rupture of a persistent urachus. 1: Abdominal wall, 2: Extraomental accumulation of anechoic fluid (uroperitoneum), 3: Greater omentum, 4: Intraomental accumulation of anechoic fluid (uroperitoneum), 5: Small intestine, Ds: Dorsal, Vt: Ventral