Purpose: Hepatic abscess (HA) is more common in Crohn's disease (CD) patients with an incidence of 114-297/100,000 compared to 8-16/100,000 in general population. HA usually form in long standing and active CD. There are no documented cases of HA in patients treated with Certolizumab. We present a case of HA that developed in a CD patient using Certolizumab. A 14 year-old male with history of CD presented with RUQ pain and distension for 3 days. He denied any fever or chills or worsening diarrhea. Clinical course of his CD was significant for recurrent small bowel obstructive symptoms and joint involvement requiring intermittent prednisone use and lack of response to Infliximab. Two months prior, he was started on Certolizumab for persistent symptoms and his last dose was 3 weeks before this visit. In the ER, he had a fever of 102.6°F, mild tachycardia with hypotension. Abdominal exam revealed a firm mass on the right side. WBC was 14500 /mm3, Albumin of 2.1 and LFTs were normal. A CT scan of the abdomen showed a 5.5 × 7.9 × 4.4 cm low attenuation lesion in the inferior right lobe of the liver suspicious for an abscess. Ileum was dilated and thickened with enhancement. Ciprofloxacin and Metronidazole were started. Abscess was aspirated by IR and a drain was placed. The aspirate cultures were positive for streptococcus intermedius. He was discharged after symptomatic improvement. Despite antibiotics and mesalamine, he continued to have abdominal symptoms. A repeat CT scan showed reduction in abscess size but significantly dilated bowel with narrowing in the distal and proximal ileum. Segmental resection and two strictureplasties of the distal ileum were done with resolution of symptoms. The degree of ileal disease on CT and resolution of his symptoms after bowel resection suggested that HA is more likely a complication of CD than a side effect of Certolizumab. Hence, after completing a six week course of antibiotics, he was restarted on Certolizumab. Our case illustrates the importance of considering HA in the differential for sudden worsening of abdominal pain in CD patients. Literature review showed no cases of HA associated with Certolizumab use. Degree of bowel inflammation and the overall clinical picture must be considered before incriminating immunomodulators. Incidence of serious infection has not been shown to increase in the treatment of CD with biologic agents in recent studies. In the Precise II trial, there were reports of 6 patients with abscess formation in the Certolizumab treatment group as opposed to 3 such infections in the placebo group. Two recent meta-analyses did not demonstrate a difference in overall infection between patients treated with biologic agents.
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