In December 2007, a 5-year-old dairy cattle with jugular pulsation, harsh murmur, tooth grinding, weakness and loss of milk yield was referred to the department of clinical sciences, and due to clinical signs, endocarditis was diagnosed tentatively. In the slaughterhouse, a large non gravid hydatid cyst with 4-cm diameter was observed in the right ventricle that contains multiple daughter cysts. Histopathological examination showed some degrees of myocyte atrophy, severe myocardial fibrosis, and presence of numerous giant cells adjacent to the cyst wall. The present case report decides to explain the clinical signs of an unusual hydatid cyst occurrence.

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