- Non-anatomical (wedge) resection
- Removes tumour with a margin of normal tissue but not according to segmental anatomy
- Useful for peripheral lesions, small tumours, or metastases
- Preserves more liver parenchyma
- Typically guided by intraoperative ultrasound
- Shorter operative time and technically less demanding
- Anatomical liver resection
- Removes liver along defined segmental, sectoral, or lobar boundaries based on portal venous and biliary anatomy
- Examples include:
- Segmentectomy (e.g. segment 6)
- Sectionectomy (e.g. left lateral sectionectomy: segments 2 and 3)
- Right or left hepatectomy (lobectomy)
- Extended hepatectomy (right plus segment 4 or left plus segment 5/8)
- Allows more complete removal of tumour-bearing portal territories
- Technically more demanding, often requires inflow and outflow control, and parenchymal transection along anatomical planes