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Primary hepatic tumours are rare, however, the liver is a common site of metastatic tumours due to the rich blood supply (hapatic portal vein and hepatic artery). Malignant primary tumours include:

* Primary hepatic tumours are rare (less than 1.5% of all canine tumours and 1.0-2.9% of all feline tumours) * However, the liver is a common site of metastatic tumours due to the rich blood supply (hapatic portal vein and hepatic artery)  

* [[Liver Proliferative - Pathology #Hepatocytic|Hepatocellular carcinoma]]

* In dogs, metastasis to the liver is 2.5 times more likely than primary neoplasia

* [[Liver Proliferative - Pathology #Cholangiocellular|Cholangiocellular carcinoma]]

* Gall bladder carcinoma

* [[Liver Proliferative - Pathology #Haemangiosarcoma|Haemangiosarcoma]]

* Mast cell tumour

* Malignant primary tumours include:

* Hepatic carcinoids

** [[Liver Proliferative - Pathology #Hepatocytic|Hepatocellular carcinoma]]

** [[Liver Proliferative - Pathology #Cholangiocellular|Cholangiocellular carcinoma]]

** Gall bladder carcinoma

** [[Liver Proliferative - Pathology #Haemangiosarcoma|Haemangiosarcoma]]

** Mast cell tumour

** Hepatic carcinoids (neuroendocrine)

Benign tumours include:

Benign tumours include:

* [[Liver Proliferative - Pathology #Hepatocytic|Hepatocellular adenoma]] (hepatoma)

** [[Liver Proliferative - Pathology #Hepatocytic|Hepatocellular adenoma]] (hepatoma)

* [[Liver Proliferative - Pathology #Cholangiocellular|Cholangiocellular adenoma]]

** [[Liver Proliferative - Pathology #Cholangiocellular|Cholangiocellular adenoma]]

* Gall bladder adenoma

** Gall bladder adenoma

Note: Distinction must be made between all hepatic tumours and benign nodular hyperplasia frequently observed in the canine. The most significant primary tumours in the dog are hepatomas, hepatocellular and cholangiocellular carcinomas and hepatic carcinoids. Hepatocellular carcinomas and cholangiocarcinomas are the most significant in cats.

Note: Distinction must be made between all hepatic tumours and benign nodular hyperplasia frequently observed in the older canine. The most significant primary tumours in the dog are hepatomas, hepatocellular and cholangiocellular carcinomas and hepatic carcinoids. Hepatocellular carcinomas and cholangiocarcinomas are the most significant in cats.