Alveolar echinococcosis in an Ontario dog resembling an hepatic abscess.

: A boxer dog was evaluated because of lethargy, vomiting, and abdominal pain. Ultrasonography revealed multiple cystic structures in the abdomen. Exploratory laparotomy revealed 3 well-encapsulated hepatic masses and abdominal effusion with suppurative inflammation. Collectively, these findings suggested the hepatic masses were most likely abscesses. However, histologic examination of the hepatic masses revealed multi-cystic structures, consistent with alveolar echinococcosis. The diagnosis was confirmed by DNA sequencing. The dog was treated with daily albendazole, but within a few weeks exhibited adverse side effects. After 6 months, the dog's condition deteriorated, and it was euthanized.