Figure 3. Primary systemic amyloidosis in a 65-year-old woman with new-onset explosive diarrhea in addition to chronic low-grade abdominal pain. Axial CT image enhanced with intravenously administered contrast material shows diffusely thickened loops of small intestine. The differential diagnosis included infectious enteritis, ischemia, and an infiltrating process. Endoscopic biopsy demonstrated amyloid deposition.