{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,3]],"date-time":"2026-06-03T09:00:13Z","timestamp":1780477213430,"version":"3.54.1"},"reference-count":13,"publisher":"BMJ","issue":"11","content-domain":{"domain":["bmj.com"],"crossmark-restriction":true},"short-container-title":["BMJ Case Rep"],"accepted":{"date-parts":[[2021,10,23]]},"published-print":{"date-parts":[[2021,11]]},"abstract":"<jats:p>The pancreaticoduodenal arteries are rare sites for true aneurysm formation, but these may develop in association with occlusion of the coeliac circulation, degenerative conditions or inflammatory vascular disorders. These have a high risk of rupture regardless of size or other factors. One identified cause is polyarteritis nodosa (PAN), which is an autoimmune necrotising vascular condition that affects small-sized and medium-sized arteries. We report a case of a 40-year-old man with massive gastrointestinal tract bleeding from a ruptured pancreaticoduodenal artery aneurysm secondary to PAN. This was managed with emergent open aneurysm ligation followed by high-dose corticosteroids and cyclophosphamide pulse therapy. Only three other cases of PAN-associated pancreaticoduodenal artery aneurysms have been reported in the literature.<\/jats:p>","DOI":"10.1136\/bcr-2021-247359","type":"journal-article","created":{"date-parts":[[2021,11,19]],"date-time":"2021-11-19T10:36:28Z","timestamp":1637318188000},"page":"e247359","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":3,"title":["Pancreaticoduodenal artery aneurysm associated with polyarteritis nodosa presenting as massive upper gastrointestinal bleeding"],"prefix":"10.1136","volume":"14","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0405-6277","authenticated-orcid":false,"given":"Juan Carlos Reyes","family":"Abon","sequence":"first","affiliation":[{"name":"Department of Surgery, University of the Philippines Manila, Manila, Philippines"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0887-2498","authenticated-orcid":false,"given":"Marc Paul 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