Partial Hepatectomy Procedure

Liver HealthQ&AMeongsiljang Veterinary Advisory Board

Partial hepatectomy is a surgical procedure that removes the portion of the liver damaged by tumors, cysts, or trauma. We’ve compiled all the essential information pet owners need to know, including the surgical process, associated risks, and recovery period.

What Is Partial Hepatectomy?

Anatomical structure of the dog's liver and hepatic lobes with tumors

Partial hepatectomy is an abdominal surgery that removes the damaged portion of the liver—such as a lobe affected by tumors, cysts, or trauma—while preserving the healthy tissue. While primary liver tumors are not common, the liver’s rich blood supply makes it a frequent site for metastasis from cancers originating elsewhere. The most critical factors are surgical indications and timing. The extent of resection varies individually based on the animal’s residual liver function and overall health status, so veterinarians must make careful judgments based on preoperative test results. Notably, studies have shown that in cats, partial hepatectomy for solitary lesions can extend survival time. The best outcomes are expected when the tumor is confined to a single lobe with no evidence of metastasis. Therefore, thoroughly examining the entire abdominal cavity to directly confirm the absence of metastasis before surgery is of utmost importance.

When Is Partial Hepatectomy Necessary?

There are four main situations in which a partial hepatectomy is necessary. - Liver tumors: When a primary tumor, such as hepatocellular carcinoma or cholangiocarcinoma, is confined to a single lobe. - Liver cysts: When the cyst has grown large enough to compress surrounding organs or poses a risk of rupture. - Liver trauma: When the liver is lacerated due to accidents like car collisions or falls, resulting in internal bleeding within the abdominal cavity. - Hepatic lobe torsion: A medical emergency in which a liver lobe twists, cutting off blood flow. Immediate emergency surgical intervention is required once symptoms appear.

Essential Preoperative Tests

It is essential to conduct a thorough assessment of liver function and overall health before anesthesia. Skipping these tests significantly increases the risk of intraoperative bleeding, hypotension, and anesthesia-related complications.

Required Preoperative Test Items

Item	What is checked	Reason
Blood test	Liver values (ALT, AST, ALP)	Assess remaining liver functional capacity
Coagulation test	PT, aPTT, platelets	Evaluate intraoperative bleeding risk
Abdominal ultrasound	Tumor location and size	Determine extent of resection
CT scan	Vascular invasion	Determine surgical feasibility
Chest X-ray	Lung metastasis	Confirm surgical indication

Coagulation testing in particular is essential — the liver produces clotting factors, so if its function is impaired, bleeding may not stop.

How Partial Hepatectomy Is Performed

The duration of surgery varies depending on the extent of resection and the tumor’s location and size. - Step 1: Anesthesia: After inducing general anesthesia, a midline incision is made in the abdomen. - Step 2: Abdominal exploration: The entire liver is examined to directly confirm the tumor’s location and check for metastasis. - Step 3: Lobular separation: The blood vessels and bile ducts of the lobe to be resected are individually ligated and occluded. - Step 4: Resection: The liver parenchyma is transected using a stapler or ligatures, and the lobe is removed. - Step 5: Hemostasis and closure: Bleeding is carefully checked, and the abdominal cavity is closed. Tissue samples are always sent for histopathological examination to definitively determine the nature of the tumor.

A veterinarian performing a step-by-step liver resection surgery on a puppy.

Major Surgical Risks

Partial hepatectomy is one of the more challenging abdominal surgeries. The greatest risk is massive hemorrhage, and tumors located near the central veins carry a high risk of vascular injury. Bile leakage can also occur within a few days after surgery, and extensive resection may lead to hepatic failure. The risk is even higher in emergency situations such as hepatic lobe torsion, or in cases of severe anemia or coagulopathy, so it is essential to choose a veterinary hospital with an experienced surgical specialist.

Postoperative Hospitalization and Recovery Care

The length of hospitalization after surgery varies depending on the extent of the procedure and the animal’s overall health. Immediately after surgery, it is crucial to closely monitor blood pressure, body temperature, and signs of bleeding in the intensive care unit to detect early complications such as hypoglycemia and hypotension. During the initial recovery phase, small amounts of water and liquid food are gradually introduced, while pain management, fluid therapy, and antibiotic administration continue. After discharge, extended rest is essential, and walking, jumping, and climbing stairs are strictly prohibited. The veterinarian will determine when to remove sutures based on a direct assessment of wound healing. Medication schedules and dosages are also determined by the veterinarian according to the animal’s body weight and liver condition.

A puppy recovering at home after surgery

Key Points for Home Care After Discharge

Home care plays a crucial role in determining the speed of recovery. - Dietary Management: Provide easily digestible prescription food in small, frequent meals throughout the day. Follow your veterinarian’s specific instructions regarding the type of diet and feeding frequency. - Surgical Site Monitoring: Check the incision area twice daily for swelling, redness, or discharge. - Activity Restriction: Keep your pet confined to a small space for the recommended period, and prohibit jumping and climbing stairs. Your veterinarian will determine when it is safe to resume normal activity. - Follow-up Examinations: Monitor recovery through blood tests and ultrasounds according to the schedule provided by your veterinarian. Seek immediate veterinary care if vomiting, loss of appetite, or jaundice occurs.

Prognosis and Recurrence Management

Outcomes are generally favorable when benign tumors, cysts, or trauma-related lesions are surgically removed. In particular, cats with solitary hepatic cystadenomas have been shown to have longer survival times when the tumor is completely removed via lobectomy. The duration and extent of recovery can vary depending on the scope of the resection, as well as the patient’s remaining liver function and overall health status. For malignant tumors, prognosis depends on the tumor type and whether metastasis has occurred; however, studies indicate that performing a lobectomy on solitary lesions in cats can extend survival time. That said, the liver is a common site for metastasis from cancers originating elsewhere, so it is crucial to monitor for recurrence or metastasis through regular ultrasound and blood tests after surgery. The frequency of these check-ups should be determined in consultation with your veterinarian. Recurrent tumors may require additional treatment, so please be sure to keep all scheduled follow-up appointments.

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 a pet survive even if a large portion of its liver is removed?

The extent of resection varies individually depending on the animal’s overall condition and remaining liver function. Therefore, based on preoperative test results, the veterinarian determines the safe extent of resection. Although the remaining tissue can compensate for lost function after resection, excessive removal can be dangerous, so careful evaluation is essential.

How much will the surgery cost?

Costs vary widely depending on the hospital, tumor location, surgical complexity, and length of hospital stay. For the most accurate estimate, we recommend receiving a detailed cost breakdown directly from your veterinarian after pre-surgical examinations and consultations.

Do cats undergo the same surgery?

Yes, cats can also undergo partial hepatectomy for liver tumors or cysts. In fact, studies have shown that cats with solitary lesions who undergo lobectomy tend to have longer survival times. However, nutritional management before and after surgery can be challenging in cats, so it’s best to follow your veterinarian’s guidance carefully for optimal care.

Is it possible to perform this procedure via laparoscopy?

Small lesions in the peripheral lobes of the liver can be addressed via laparoscopy, but traditional open surgery is safer for central or large tumors. The surgical approach will be determined by the veterinary surgeon based on the imaging results.

Will my pet’s liver enzyme levels remain elevated for life after surgery?

Usually, that's not the case. Liver enzyme levels may temporarily rise immediately after surgery, but they typically stabilize over time. However, if the levels remain elevated, further testing is necessary, so regular follow-up exams are recommended to monitor recovery.