Cholangiocellular tumours include bile duct '''carcinomas''' and '''adenomas'''. Bile duct carcinomas are the most common malignant hepatobillary tumours in cats and the second most frequent in dogs, with female animals possibly being predisposed. Intra-hepatic carcinomas are more frequent in dogs but in cats, it is unclear whether extra-hepatic masses occur more frequently or whether intra- and extra-hepatic masses occur with equal frequency. | Cholangiocellular tumours include bile duct '''carcinomas''' and '''adenomas'''. Bile duct carcinomas are the most common malignant hepatobillary tumours in cats and the second most frequent in dogs, with female animals possibly being predisposed. Intra-hepatic carcinomas are more frequent in dogs but in cats, it is unclear whether extra-hepatic masses occur more frequently or whether intra- and extra-hepatic masses occur with equal frequency. |