Current status of surgical treatment of colorectal liver metastases

Table 1 Resectability criteria for colorectal liver metastases

Item	Traditional criteria	Current criteria
EHMD	No EHMD	Stable or resectable EHMD (excluding portal lymphadenopathy)
LM number	Fewer than 4 lesions	No limit
LM distribution	Unilateral	No limit
Vascular invasion	No involvement	Amenable to venous resection or reconstruction
Resection margin width	More than 1 cm	Beyond 1 mm with a tumor-free margin
% of FLR of total liver volume	> 20%	> 20% for normal liver and slight chemotherapy-associated liver dysfunction;
		> 30%–40% for severe chemotherapy-associated liver disease

EHMD: Extra-hepatic metastatic disease; LM: Liver metastases; FLR: Future liver remnant.