Left-sided Hepatectomy (Left Hemihepatectomy or Left Trisectionectomy) Extending to the Caudate Lobe with Bile Duct Resection for Perihilar Cholangiocarcinoma
Executive Summary
Left-sided hepatectomy (hemihepatectomy or trisectionectomy) extending to the caudate lobe with bile duct resection is a standard surgical intervention for perihilar cholangiocarcinoma with left-side predominance. Due to the complex anatomical variations of the right-sided biliary and vascular structures, this procedure is technically more demanding than a right-sided hepatectomy. Successful outcomes rely on three core surgical phases: regional lymphadenectomy with skeletonization of the hepatoduodenal ligament, hepatectomy combined with extrahepatic bile duct resection, and complex biliary reconstruction.
Key clinical priorities include meticulous preoperative 3-D anatomical evaluation, management of the future liver remnant (FLR) through portal vein embolization when necessary, and the preservation of venous drainage for the right posterior segment. Postoperative management focuses on monitoring liver function and identifying early complications such as bile leaks and liver failure.
Clinical Indications and Patient Selection
The procedure is primarily indicated for malignant conditions but can be applied to specific benign diseases. Patient selection is constrained by liver functional reserve and the extent of disease metastasis.
Indications
Primary Malignancies: Perihilar cholangiocarcinoma (left-side predominance) and intrahepatic cholangiocarcinoma in the left liver involving the hepatic hilus.
Benign Diseases: Primary sclerosing cholangitis, inflammatory pseudotumor, and hepatolithiasis.
Contraindications
Preoperative Investigation and Preparation
A thorough diagnostic workup is essential to determine resectability and surgical strategy.
Diagnostic Modalities
Laboratory Testing: Comprehensive liver function panels (Bilirubin, ALP, AST, ALT, Albumin), coagulation parameters, indocyanine green retention rate at 15 min (ICG R15), and tumor markers (CEA, CA 19-9).
Radiology: Multidetector CT (MDCT) is the primary tool for evaluating cancer extension. Other modalities include ultrasonography, MR cholangiopancreatography (MRCP), and CT volumetry.
Endoscopy: Peroral cholangioscopy (POCS) or percutaneous transhepatic cholangioscopy (PTCS) for differential diagnosis and assessing intraepithelial spread via step biopsy.
Preparation Protocols
Biliary Drainage: Endoscopic biliary drainage (EBD) of the future liver remnant is preferred. Percutaneous transhepatic biliary drainage (PTBD) is used if EBD is unsuccessful.
Portal Vein Embolization (PVE): Recommended for major hepatectomies where the resection exceeds 60% of the liver, particularly in patients with obstructive jaundice.
Clinical Constraints: A biliary drainage catheter must not be placed before MDCT imaging to ensure accurate evaluation of cancer extension. Metallic stents are contraindicated in resectable biliary carcinoma.
Surgical Methodology: Left Hemihepatectomy
The standard procedure involves a series of disciplined steps to ensure oncological clearance and vascular preservation.
Initial Exposure and Dissection
Laparotomy and Inspection: Following incision and retractor installation, the abdomen is inspected for peritoneal or liver metastasis. Intraoperative ultrasonography is used to locate the tumor relative to vascular structures.
Regional Lymph Node Dissection: Lymph nodes along the common and proper hepatic arteries and the nerve plexus around these arteries are dissected.
Bile Duct Division: The distal bile duct is dissected down to the head of the pancreas and divided. Frozen section examination of the lower ductal resection margin is mandatory.
Vascular Control and Mobilization
Skeletonization: The upper hepatoduodenal ligament is skeletonized, exposing the portal bifurcation and transected distal bile duct.
Arterial and Venous Division: The left and middle hepatic arteries are divided at their origin. The left portal vein is ligated and divided distally to the bifurcation. If length is insufficient due to invasion, the vein is divided after clamping the portal trunk and right portal vein, then closed with continuous sutures.
Mobilization: The left hemiliver is mobilized by dividing the left coronary and triangular ligaments and opening the minor omentum.
Resection and Reconstruction
Caudate Lobe Separation: The caudate lobe is mobilized from the left side. Short hepatic veins are divided from the left caudal to the right cranial side. Crucially, the inferior or middle right hepatic vein must be preserved to maintain venous drainage in the right posterior section.
Liver Parenchymal Transection: Performed along the Rex-Cantlie line using a cavitron ultrasonic surgical aspirator (CUSA). The Pringle maneuver is employed (15 min inflow occlusion, 7 min reperfusion).
Intrahepatic Bile Duct Resection: The right intrahepatic bile duct is identified behind the middle hepatic vein. Sectional ducts are divided, and resection margins are confirmed by frozen section.
Biliary Reconstruction: A Roux-en-Y loop (40-cm jejunum segment) is used. Duct orifices are grouped to minimize the number of anastomoses.
Variation: Left Trisectionectomy
Left trisectionectomy involves the resection of segments 2, 3, 4, 5, and 8 along with the caudate lobe and bile duct. This is applied specifically for Bismuth type IV tumors with left-side predominance.
Vascular Nuances: Once arterial anatomy is identified, the right anterior sectional artery is ligated.
Portal Vein Management: If preoperative portal vein embolization was performed, the left portal vein must be divided after clamping the portal trunk and right portal vein to ensure no thrombus exists in the right portal vein.
Parenchymal Transection: Resection starts from the caudal edge and advances cranially, preserving the right hepatic vein on the transection plane of the right posterior section.
Postoperative Management and Complications
Surveillance and Testing
Patients require intensive care monitoring including:
Color Doppler ultrasound to evaluate blood flow in the portal vein and hepatic artery.
Frequent liver function tests (Bilirubin, AST, ALT, Albumin) and coagulation monitoring.
Inflammatory markers (WBC, CRP) and culture of drain fluid.
Potential Complications
Short-term: Pleural effusion, wound infection, intra-abdominal bleeding, portal vein thrombosis, bile leaks (from the hepatojejunostomy or raw liver surface), subphrenic/liver abscess, and liver failure.
Long-term: Anastomotic stricture, cholangitis, and chronic liver failure.
Surgical Refinements ("Tips of the Senior Surgeon")
Technical precision is highlighted through several specialized maneuvers:
3-D Evaluation: Careful preoperative assessment of the right posterior sectional hepatic artery and bile duct in relation to the right portal vein (infra-portal vs. supra-portal types).
Pressure Management: Central venous pressure (CVP) should be maintained at less than 3 to 5 cm H₂O before liver transection to minimize blood loss.
Suture Technique: Large short hepatic veins or caudate lobe veins should be sutured in a continuous fashion when mobilizing the caudate lobe from the vena cava.
Ductal Safety: Stay sutures should be placed before dividing the intrahepatic bile duct to prevent small segmental ducts from retracting and disappearing into the transected liver surface.
Lymphatic Control: Lymphatic vessels should be tied during para-aortic lymph node dissection to prevent postoperative massive lymphorrhea or chylous ascites.
