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A 74-year-old man presented history of fever and abdominal pain 1 month following a simultaneous hepatic resection and 2 radiofrequency ablations (RFA) under ultrasound control for metachronous colonic liver metastases. Contrast-enhanced computed tomography (CT) showed a collection with an air-fluid level and a hypervascular enhancing lesion within the hypodense region of the RFA (Figure 1, arrow). An arteriography confirmed the diagnosis of pseudoaneurysm (Figure 2A).