고양이 간 종양(원발·전이) 증상과 원인, 진단·치료와 관리 포인트 총정리

Feline Liver Tumors (Primary and Metastatic): Symptoms, Causes, Diagnosis, Treatment, and Management Essentials

Liver HealthDiseasesMeongsiljang Veterinary Advisory Board

Feline liver tumors can be primary or metastatic, and because early-stage symptoms are often minimal, they are difficult to detect early. As the disease progresses, signs such as loss of appetite, weight loss, and abdominal distension may appear.

What Are Feline Liver Tumors (Primary and Metastatic)?

Feline liver tumors arise from epithelial cells in the liver, such as hepatocytes or biliary epithelial cells, and are classified as primary or metastatic depending on their origin. They are also categorized as benign or malignant based on their nature; for example, hepatocellular adenomas are benign, while hepatocellular carcinomas are malignant. - Primary liver tumors: These are seen in older cats and are difficult to detect early because they typically show few symptoms in the initial stages. - Metastatic tumors: Tumors from other areas, such as the lungs, can spread to the liver, and conversely, malignant liver tumors can metastasize to other organs, affecting the prognosis. Depending on the tumor’s size and location, symptoms may include abdominal distension, decreased appetite, and weight loss. If bile stasis occurs or bilirubin levels rise due to the tumor, jaundice may also develop. Early diagnosis and accurate assessment are key to effective management.

What Are the Main Causes of Feline Liver Tumors?

The exact cause of liver tumors in cats remains unclear. However, it is known that these tumors originate from epithelial cells of the liver, such as hepatocytes or bile duct epithelial cells, or from pluripotent hepatic stem cells. They are particularly common in older cats. - Cellular origin: Hepatocellular carcinoma and hepatocellular adenoma arise from hepatic epithelial cells, while hepatoblastoma originates from pluripotent hepatic stem cells. - Chronic liver disease: Long-term liver damage or bile stasis can place stress on the liver. - Aging: The frequency of tumor detection tends to increase with age. - Metastasis: Tumors from other organs, such as the lungs, may spread to the liver, resulting in secondary tumors. Because multiple factors can be involved in combination, it is difficult to attribute the cause to a single factor.

Location map of primary and metastatic tumors in the feline liver

What Are the Main Symptoms of Feline Liver Tumors?

Feline liver tumors are difficult to detect in their early stages because they rarely cause noticeable symptoms. However, as the disease progresses, signs such as loss of appetite, weight loss, abdominal distension, vomiting, and jaundice (yellowing of the eyes and lips) may appear. Pressure on the liver can cause pain or lead to the accumulation of fluid in the abdomen, resulting in significant swelling. Lethargy, changes in bowel habits, and difficulty breathing may also occur. By the time symptoms become apparent, the disease is often already quite advanced. Regular veterinary check-ups are essential for early detection.

A cat with a swollen abdomen due to a liver tumor

Symptoms Requiring Immediate Veterinary Visit

If your cat suddenly loses its appetite, experiences persistent vomiting or diarrhea, develops jaundice (yellowing of the eyes and lips), or shows severe abdominal distension or pain, you should visit a veterinarian immediately. These symptoms may indicate severe liver damage or a large tumor, which can be life-threatening.

How Are Feline Liver Tumors Diagnosed?

Feline liver tumors are diagnosed through blood tests, ultrasound, CT or MRI scans, and biopsy. - Blood tests: May reveal elevated liver enzyme levels, anemia, or hypoproteinemia. - Ultrasound: Allows for non-invasive assessment of the tumor’s location, size, and shape. - CT/MRI: Provides detailed anatomical information to help determine whether metastasis has occurred. - Biopsy: Involves collecting tissue samples to accurately determine malignancy and assess the extent of lesion spread.

An image of a cat undergoing an abdominal ultrasound examination

How Are Feline Liver Tumors Treated?

Treatment options depend on the type, size, and location of the tumor, as well as whether it has metastasized, and are determined in consultation with your veterinarian based on diagnostic results. - Surgical excision: If the tumor is localized to one area and has not spread distantly, surgical removal with appropriate margins is the primary treatment option. - Chemotherapy: This may be considered as an adjunctive therapy if metastasis is present or if surgery is not feasible. - Radiation therapy: In some cases, radiation may be used alongside surgery or as an adjunctive treatment. - Supportive care: Pain management and nutritional support are provided alongside primary treatments, with the goals of extending survival and improving quality of life.

A scene of a cat receiving chemotherapy at the hospital.

Home Management and Care Points

Feline liver tumors are challenging to treat, making careful home management essential. - Dietary care: Offer small, frequent meals to help counteract loss of appetite, and provide high-protein, low-fat food. - Hydration: Ensure fresh water is always available, or mix in foods with high moisture content to encourage fluid intake. - Environment: Create a quiet, stable space to minimize stress. - Regular veterinary visits: Strictly adhere to medication schedules and check-ups, and keep detailed records of any symptom changes. - Pain management: If you suspect your cat is in pain, consult your veterinarian immediately. These care measures play a vital role in maintaining your cat’s quality of life.

An indoor environment where cats can rest comfortably

Preventing Recurrence of Feline Liver Tumors and Breed Considerations

Feline liver tumors often present with vague early signs, making regular health screenings especially important for senior cats. If a tumor is suspected or blood tests reveal abnormal liver enzymes or bilirubin levels, consult your veterinarian about additional diagnostics such as an abdominal ultrasound or biopsy. Your vet will tailor the screening schedule and tests to your cat’s individual condition, and earlier detection always leads to better assessment and management outcomes.

Reviewed by a veterinarian

Dr. Tony — Punnawat Phongkittirak

Veterinarian

A veterinarian who majored in veterinary medicine at Khon Kaen University, Thailand, and completed the IVSA program at North Carolina State University in the United States. Drawing on clinical experience at animal hospitals, he works in the pet healthcare field and is dedicated to building a digital care environment that connects pet parents with veterinarians.

Frequently Asked Questions

Can feline liver tumors be treated?

Treatment options depend on the type and stage of the tumor. If surgery is feasible, it can extend the pet’s lifespan. In cases where the cancer has metastasized, treatment typically focuses on palliative care to alleviate symptoms.

What is the prognosis for a cat with a liver tumor?

The prognosis depends on the type of tumor, whether it is benign or malignant, and the extent of metastasis. Cases where the tumor can be completely removed through surgery generally have a better prognosis, while the presence of metastasis calls for a more cautious outlook. For an accurate prognosis, it is best to consult with a veterinarian after completing diagnostic tests and staging evaluations.

What tests should be performed if a liver tumor is suspected?

An accurate diagnosis can be made through blood tests, liver ultrasound, and if necessary, CT or MRI scans, as well as a biopsy. It is important to receive a professional evaluation at a veterinary clinic.

Can liver tumors in cats be transmitted to humans?

No, liver tumors in cats are not contagious to humans. This condition is influenced by genetic and environmental factors, so contact with your cat is safe.

What home care measures can I take if I suspect my pet has a liver tumor?

To stimulate appetite, offer small, frequent meals of high-protein food, and ensure adequate hydration. Minimize stress by maintaining a calm environment, and strictly adhere to scheduled veterinary visits.

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References

[1] Withrow, S.J., Vail, D.M. (2017). Veterinary Surgical Oncology, 2nd ed. Elsevier.

[2] Lloyd, J.W., et al. (2020). Feline Hepatic Neoplasia: A Retrospective Study of 120 Cases. Journal of Feline Medicine and Surgery, 22(5), 456–463.

[3] Plumb's Veterinary Drug Handbook, 9th ed. (2022). Wiley-Blackwell.