Inclusion Criteria:  Histologically verified colorectal cancer Colorectal liver metastases (proven or suspected) eligible for radical treatment using EITHER resection OR ablation (not a combination), as decided by the liver MDT meeting at the study center The patient is fit to undergo both resection and ablation of all liver metastases Size of largest lesion up to and including 30 mm In case of solitary metastasis, resection plan includes resection of ≤ 2 anatomical segments. In case of multiple metastases in one continuous resection, resection plan can include ≤ 4 anatomical segments (including hemihepatectomy) ≤ 5 tumors to be treated in one procedure Primary tumor either resected (primary first) or with a plan for curative treatment (liver first).  Exclusion Criteria:  • More than 3 lung metastases where 1 is >10mm, or 1 lung metastasis >15 mm (OR: unresectable lung metastases as decided by the lung MDT meeting)  Presence of extrahepatic, extrapulmonary metastases. Surgical indication for removal of enlarged lymph nodes in the hepatic hilum. (Enlarged lymph nodes without indication of removal are not considered an exclusion criterium) Tumor closer than 10 mm to right/left main bile duct Suspected tumor infiltration to adjacent organs Progression (as of RECIST [18]) on 2nd line chemotherapy Previous inclusion in this trial Not eligible for workup according to study criteria Contraindication to contrast enhanced CT scan Manifest liver cirrhosis Pregnancy ECOG performance status ≥3 Simultaneous resection of primary tumor or any other concomitant surgical procedure Any other reason why, in the investigator's opinion, the patient should not be included.