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Key Facts

• Metastatic cancer 2.5x more common than primary liver tumors
• Hepatocellular carcinoma: most common primary tumor in dogs
• Biliary adenoma: most common primary tumor in cats (>50%)
• Massive tumors most amenable to surgical removal
• Hepatocellular carcinoma grows slowly — surgery yields 4-year median survival
• Needle aspirate correct diagnosis in 60%, biopsy in 90%
• Ultrasound is key imaging modality for evaluation and guided sampling