Fig. 1

Ultrasonogram of a perforated abomasal ulcer. Ultrasonogram of a perforated (type-3) abomasal ulcer in a Jersey cow. The abomasum is characterised by an irregularity in its contour measuring several centimetres and containing a 2.5 cm (width) × 1.5 cm (depth) hyperechogenic plug-like structure (fibrin clot). A comet-tail artefact is visible medial to the hyperechogenic mass. Echogenic (fibrinous) changes are seen between the abdominal wall and the abomasum. 1 Abdominal wall, 2 echogenic fibrin layer, 3 abomasal wall, 4 hyperechogenic fibrin clot, 5 comet-tail artefact, Cr cranial, Cd caudal