A two years-old Holstein cow with poor appetite, reduced milk production, and partial defecation was evaluated in the present case report. After routine laboratory and clinical examinations, the animal further received ultrasound examination and then a right fossa paralumbal exploratory laparotomy was performed to the cow. The cow was diagnosed with ectopic reticulum on the laparotomy. After the content of the reticulum was removed, liquid paraffin was administered into the reticulum and its wall and abdominal wall was sutured as routinely. The prognosis of the animal deteriorated gradually following to the laparotomy and it was slaughtered by its owner. This is the first report showing the presence of an ectopic reticulum in a cow.

Key words: Anomaly, Cow, Ectopia, Reticulum