Small Bowel Perforation Post-RYGB Linked to Apolipoprotein A-IV Amyloidosis
Overview
A rare case of small bowel perforation following Roux-en-Y gastric bypass (RYGB) was attributed to apolipoprotein A-IV (AApoA-IV) type amyloidosis in a patient with Crohn's disease (CD) and rheumatoid arthritis (RA). This report highlights the diagnostic challenge and clinical considerations when bariatric surgery is performed in patients with inflammatory bowel disease (IBD).
Background
Amyloidosis involves abnormal protein deposits in tissues and can rarely cause small bowel perforation, especially in patients with inflammatory bowel disease. Obesity prevalence among IBD patients is rising, leading to increased bariatric surgeries such as sleeve gastrectomy (SG) and RYGB. Bariatric surgery in IBD patients requires careful risk-benefit analysis due to potential complications. This case describes AApoA-IV amyloidosis causing small bowel perforation after conversion from SG to RYGB in a patient with CD and RA.
Data Highlights
The patient, a woman in her 50s with CD and RA, underwent conversion from SG to RYGB due to severe reflux symptoms. Fifteen days postoperatively, she presented with abdominal pain and imaging showed jejunal distension near the distal anastomosis. Surgery revealed a contained small bowel perforation at the distal anastomosis. Histopathology confirmed amyloid deposits consistent with AApoA-IV type amyloidosis. Post-revision, the patient recovered well with minimal reflux symptoms at 16-month follow-up but persistent fatigue.
Key Findings
Amyloidosis can cause small bowel perforation post-bariatric surgery, a rare but important consideration in IBD patients.
This patient’s amyloidosis was identified as AApoA-IV type, distinct from the more common AA amyloidosis associated with chronic inflammation in IBD and RA.
Conversion from SG to RYGB was performed due to refractory reflux symptoms and anatomical considerations.
Histopathology with Congo red staining and mass spectrometry was critical for amyloid subtype diagnosis.
Postoperative recovery was uneventful after revision surgery, with no cardiac or renal amyloid involvement detected.
Persistent fatigue remained a symptom despite resolution of gastrointestinal complications.
Clinical Implications
Clinicians should consider amyloidosis as a differential diagnosis for small bowel perforation in IBD patients undergoing bariatric surgery. Preoperative evaluation and postoperative vigilance are essential, especially when symptoms suggest complications near anastomotic sites. Histopathological analysis including amyloid subtyping can guide diagnosis and management. Bariatric surgery remains a viable option in IBD patients but requires multidisciplinary assessment to balance benefits and risks.
Conclusion
This case underscores the importance of recognizing rare causes such as AApoA-IV amyloidosis in small bowel perforations following bariatric surgery in IBD patients. Careful surgical planning and thorough pathological evaluation are key to optimal outcomes.
References
Author/Source/Year -- Small Bowel Perforation Following Roux-en-Y Gastric Bypass Associated with Apolipoprotein A-IV Type Amyloidosis
