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===Hepatocellular Tumours (Hepatocellular carcinomas (HCC) and Hepatomas)===
===Hepatocellular Tumours (Hepatocellular carcinomas (HCC) and Hepatomas)===
* HCC occurs more frequently in dogs and hepatomas more commonly in cats. Male dogs over 10 years old are the most frequently affected. Miniature schnauzers may have a breed predisposition.
* HCC occurs more frequently in dogs and hepatomas more commonly in cats. Male dogs over 10 years old are the most frequently affected. Miniature schnauzers may have a breed predisposition.
* Regional lymph nodes, peritoneum and lungs are the most frequent sites of metastasis in dogs with nodular and diffuse HCC.
* Metastatic rate for dogs with massive HCC: 0-37%
* Metastatic rate for dogs with nodular and diffuse HCC: 93-100%
* Hepatomas are usually incidental findings and non-significant
* Hepatomas are usually incidental findings and non-significant
===Cholangiocellular Tumours (Bile duct carcinomas and adenomas)
* Bile duct carcinomas are the most common malignant hepatobillary tumours in cats and the second most frequent in dogs, particularly females
* Intrahepatic carcinomas are more frequent in dogs. In cats there have been reports of both equal levels of occurrence of intra-and extrahepatic tumours and of a a extrahepatic dominance.
* Bile duct carcinomas are aggressive with metastasis to particularly the regional lymph nodes and lungs frequently being observed in dogs and diffuse intraperitoneal metastasis and carcinomatosis being common in cats.
* Bile duct adenomas (also known as biliary or hepatobiliary cystadenomas) are common in cats, particularly males.
* Bile duct adenomas are non-significant unless they of sufficient size to compress surrounding soft tissue structures
Cholangiocellular carcinoma occurs more commonly in female cats
Cholangiocellular carcinoma occurs more commonly in female cats
==Treatment and Prognosis=
==Treatment and Prognosis==
==References==
==References==