 The FDG-PET studies will be read on site. The final result of FDG-PET alone will be communicated to the referring surgeon on a confidence scale as a normal or benign disease, b probably no malignancy, c malignantbenign unclear d definitely malignant disease. Further evaluation will take place by joint reading of FDG-PET and CT of the chest and abdomen, the combined reading will again be scored on the same confidence scale to allow estimation of increased confidence in the co-interpreted procedures. The combination of these tests will form the basis for the surgeons decision making. In case of concordant evidence of extra-hepatic disease the patient is considered to be non-resectable. In case of discordance between CT and FDG-PET, it is at the referring surgeons discretion to request additional diagnostic tests, to reject the option of laparotomy or to attempt surgical resection of the liver metastases. 