Ultrasonogram in the right flank showing peritonitis. Ultrasonogram obtained using a 5.0-MHz convex transducer placed in the ventral right flank region in cow 2. The intestines are mildly dilated, have a thickened wall and contain fluid. Echoic fibrin is evident between loops of small intestines. 1 abdominal wall, 2 small intestines with thickened wall, 3 fibrin between loops of small intestines, 4 rumen, Ds dorsal, Vt ventral