EN
Cholangiocarcinoma has been diagnosed in a 9-year-old cockatiel (Nymphicus hollandicus). Nodules, 1 to 5 mm in diameter, white to brown-red in colour, were visible all over the surface of the liver. A microscopic examination revealed the presence of acinar cells resembling biliary epithelium, with numerous mitotic figures and "lakes" of mucin among them. Neoplastic changes were accompanied by necrosis of the liver tissue and inflammatory infiltrations. This case of cholangiocarcinoma is the first one recorded in a cockatoo parrot.