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==Hepatocellular Tumours (Hepatocellular carcinomas (HCC) and Hepatomas)==
===Signalment and Description===
* 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.
* 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 nodular and diffuse HCC: 93-100%
* 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
===Treatment and Prognosis===
==Cholangiocellular Tumours (Bile duct carcinomas and adenomas)==
===Signalment and Description===
* Bile duct carcinomas are the most common malignant hepatobillary tumours in cats and the second most frequent in dogs, particularly females
* 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.
* 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 adenomas (also known as biliary or hepatobiliary cystadenomas) are common in cats, particularly males.
* 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
* Bile duct adenomas are non-significant unless they of sufficient size to compress surrounding soft tissue structures
==Carcinoids (Neuroendocrine Tumours)==
===Signalment and Description===
* Usually occur in younger animals compared with other primary hepatobiliary tumours.
* Primary tumours are aggressive and often affect more than one liver lobe and metastasise to most frequently the regional lymph nodes, the lungs and peritoneum.
==Sarcomas (Haemangiosarcoma (HSA), Leiomyosarcoma, Fibrosarcoma)==
===Signalment and Description===
* HSA is the most common hepatic sarcoma in cats
* Leiomyosarcoma is the most common hepatic sarcoma in dogs
* These tumours are aggressive and metastasis to the spleen and lungs is frequently observed.