A two-year-old castrated male Dutch rabbit (Oryctolagus cuniculus) was referred due to acute onset of anorexia. A firm, non-painful, round, approximately 10 cm diameter mass was palpated in the left cranial abdomen. No other major abnormalities were identified during physical exam. Radiography and ultrasonography characterised the mass. Exploratory laparotomy revealed a pedunculated mass attached to the quadrate hepatic lobe which was removed without complications. Histopathology confirmed the complete removal of a mass identified as hepatic biliary cystadenoma not showing evidence of malignancy or intra-hepatic dissemination. The rabbit was healthy on further rechecks up to one year later. This is the second reported case of diagnosis and successful removal of a biliary cystadenoma in a rabbit with the peculiarity of this patient being a male rabbit. Biliary cystadenoma should, therefore, be part of the differential diagnosis of hepatic neoplasia in male domestic rabbits.
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