A 20-year-old woman with active Crohn's disease had an abrupt onset of high fever accompanied by an elevation of serum gamma-glutamyltransferase and alkaline phosphatase. Her past medical history included a course of corticosteroid therapy for 7.5 months and a resection of the terminal ileum and the cecum 2 months before admission. At that time an ileoascendostomy had been performed, revealing a walled-off perforation of the colon into the retroperitoneal space. Sonography revealed 2 large abscesses in the right lobe of the liver. After beginning antibiotics, ultrasound-guided percutaneous aspiration and drainage with a pigtail catheter were performed for both abscesses leading to a rapid reduction of their size and an improvement in the patients general condition. Liver abscess represents a rare complication of Crohn's disease. A review of the literature is presented.