A 62-year-old man with epigastralgia was referred to our hospital for the evaluation of an intractable duodenal ulcer, which did not improve following proton pump inhibitor treatment. An upper gastrointestinal endoscopy revealed that the base of the ulcer was gray-white in color with conspicuous fibrosis tissue, unlike the appearance of common ulcers. A contrast-enhanced abdominal CT scan and angiography revealed tortuous and dilated vascular structures in the pancreatic head. This was diagnosed as a pancreatic arteriovenous malformation. We suggest that the intractable duodenal ulcer was caused by the pancreatic arteriovenous malformation. Therefore, we performed a pancreaticoduodenectomy. Pancreatic arteriovenous malformations should be considered as one of the causes of treatment-resistant duodenal ulcers.
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