What Is Hepatectomy?

Hepatectomy is the surgical resection of part or all of the liver, performed to treat primary liver tumors, metastatic disease from colorectal and other cancers, benign lesions such as hemangiomas, and for living-donor organ transplantation. The liver's unique capacity for regeneration, recovering up to 70 percent of its volume within weeks after resection, enables surgeons to remove substantial portions of the organ while preserving adequate function for the patient. Hepatectomy ranges from minor wedge excisions removing less than two segments to extended resections such as right trisectionectomy, in which five of the eight Couinaud liver segments are removed.

The field draws on detailed anatomical knowledge of the hepatic vascular tree, surgical technique, and an understanding of hepatic physiology. Modern hepatectomy has evolved from a high-mortality procedure to a routine elective operation at specialized centers, with operative mortality below five percent for appropriate candidates. Preoperative planning relies on cross-sectional imaging and volumetric analysis of the liver, while intraoperative guidance uses ultrasound to identify vessel relationships in real time.

Resection Anatomy and Planning

The Couinaud classification divides the liver into eight functionally independent segments, each supplied by its own branch of the portal vein, hepatic artery, and bile duct, and drained by a hepatic vein. This anatomical framework guides surgical planning by identifying which segments contain the pathology and which must be preserved to maintain adequate hepatic reserve. Future liver remnant volume, estimated from CT volumetry, must typically exceed 25 to 30 percent of total liver volume in a healthy liver, and 40 percent or more in patients with underlying cirrhosis or chemotherapy-associated hepatotoxicity. The NIH PMC review of hepatic resection techniques covers the surgical anatomy and decision framework for choosing resection extent, including indications for portal vein embolization to induce hypertrophy of the future remnant before a staged resection.

Surgical Approaches and Parenchymal Transection

Hepatectomy can be performed through open laparotomy, laparoscopic approaches, or robot-assisted surgery. Laparoscopic major hepatectomy has become standard at high-volume centers, offering reduced blood loss, shorter hospital stay, and faster return to adjuvant chemotherapy compared to open surgery, without compromising oncological outcomes. The PMC study on laparoscopic major hepatectomy technique and outcomes reports mean operating times around 227 minutes and blood transfusion rates below 11 percent in experienced hands. Parenchymal transection techniques include the crush-clamp method, ultrasonic dissectors (CUSA), bipolar coagulation, and stapling devices for major hepatic veins. The Pringle maneuver, temporarily clamping the hepatoduodenal ligament to reduce inflow bleeding during transection, is applied intermittently in most major resections. Intraoperative ultrasound guides the transection plane and identifies vascular anatomy not visible on preoperative imaging.

Perioperative Management and Outcomes

Postoperative management centers on monitoring hepatic function and managing the expected transient rise in liver enzymes following parenchymal transection. Bile leak, the most common hepatectomy-specific complication, occurs in five to ten percent of cases and is usually managed non-operatively with drainage. Posthepatectomy liver failure, defined by the International Study Group of Liver Surgery as bilirubin above 50 micromoles per liter and an elevated INR on postoperative day five, is the most serious complication and is closely related to inadequate remnant volume or pre-existing parenchymal disease. The Cleveland Clinic hepatectomy clinical overview describes the recovery trajectory and follow-up requirements for patients after liver resection surgery.

Applications

Hepatectomy has applications in a wide range of clinical fields, including:

• Colorectal cancer liver metastasis resection for curative intent
• Primary hepatocellular carcinoma treatment in patients with adequate liver reserve
• Living-donor liver transplantation, both pediatric and adult
• Resection of intrahepatic cholangiocarcinoma
• Surgical management of complicated hepatic echinococcosis