Inclusion Criteria:  Patients consecutively treated for colorectal cancer a Availability of imaging by injected abdominal scanner including at least one portal phase Age over 18  Exclusion Criteria:  Patients with treatment of the hepatic nodule by ablation or previous hepatic surgery Imaging follow-up <12 months Non-interpretable scanner (artefact, injection quality, etc.) Patients with more than 10 liver metastases