{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,28]],"date-time":"2026-10-28T15:47:03Z","timestamp":1793202423672,"version":"4.5.0"},"reference-count":23,"publisher":"Georg Thieme Verlag KG","issue":"12","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Z Gastroenterol"],"published-print":{"date-parts":[[2023,12]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>\n            Background Retroperitoneal fibrosis (RPF), often referred to as Ormond\u2019s disease when it is of idiopathic origin, is a rare disease characterized by the presence of inflammatory infiltrates and periaortic masses in the retroperitoneum. For a definite diagnosis, a biopsy and subsequent pathological examination is required. Currently accepted methods for retroperitoneal biopsy include open, laparoscopic, or CT-guided approaches. However, transduodenal endoscopic ultrasound-guided fine-needle aspiration\/biopsy (EUS-FNA\/FNB) for diagnosis of RPF has attracted only little attention in the literature.<\/jats:p><jats:p>\n            Case Reports We report two male patient cases who presented with leukocytosis, elevated C-reactive protein, and a suspicious retroperitoneal mass of unknown origin on computed tomography. One patient also reported left lower quadrant pain, whereas the other patient suffered from back pain and weight loss. In both patients, idiopathic RPF was successfully diagnosed by using transduodenal EUS-FNA\/FNB with 22- and 20-gauge aspiration needles. Histopathology revealed dense lymphocytic infiltrates and fibrosis. The procedures lasted approximately 25 and 20 minutes, respectively, and in both patients no serious adverse events occurred. Treatment included steroid therapy and administration of Azathioprine.<\/jats:p><jats:p>\n            Conclusion We demonstrate that using EUS-FNA\/FNB to diagnose RPF is a feasible, fast, and safe method, which should always be considered as a first-line diagnostic modality. Hence, this case report emphasizes that gastrointestinal endoscopists are likely to play an important role in the setting of suspected RPF.<\/jats:p>","DOI":"10.1055\/a-2003-9752","type":"journal-article","created":{"date-parts":[[2023,3,27]],"date-time":"2023-03-27T22:39:50Z","timestamp":1679956790000},"page":"1623-1627","source":"Crossref","is-referenced-by-count":1,"title":["Role of transduodenal endoscopic ultrasound-guided fine-needle aspiration\/biopsy (EUS-FNA\/FNB) for diagnosis of retroperitoneal fibrosis (Ormond\u2019s disease)"],"prefix":"10.1055","volume":"61","author":[{"given":"Damian","family":"Wiedbrauck","sequence":"additional","affiliation":[{"name":"Department of Gastroenterology, Allgemeines Krankenhaus Celle, Celle, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Peer","family":"Flemming","sequence":"additional","affiliation":[{"name":"Institute of Pathology, Celle, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Stephan","family":"Hollerbach","sequence":"additional","affiliation":[{"name":"Department of Gastroenterology, Allgemeines Krankenhaus Celle, Celle, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"194","published-online":{"date-parts":[[2023,3,27]]},"reference":[{"key":"ref1","doi-asserted-by":"publisher","first-page":"387","DOI":"10.1111\/iju.14218","article-title":"Current approach to diagnosis and management of retroperitoneal fibrosis","volume":"27","author":"T Tanaka","year":"2020","journal-title":"Int J Urol"},{"key":"ref2","first-page":"60","article-title":"Retroperitoneal fibrosis: A literature review","volume":"73","author":"J Rivas","year":"2020","journal-title":"Archivos espanoles de urologia"},{"key":"ref3","doi-asserted-by":"publisher","first-page":"423","DOI":"10.2214\/ajr.07.3629","article-title":"Retroperitoneal fibrosis: a review of clinical features and imaging 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