{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,20]],"date-time":"2026-08-20T09:29:01Z","timestamp":1787218141435,"version":"build-2736575974"},"reference-count":10,"publisher":"Wiley","issue":"1","license":[{"start":{"date-parts":[[2026,8,20]],"date-time":"2026-08-20T00:00:00Z","timestamp":1787184000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2026,8,20]],"date-time":"2026-08-20T00:00:00Z","timestamp":1787184000000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["DEN Open"],"published-print":{"date-parts":[[2027,4]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:p>Traumatic neuroma of the cystic duct stump is a rare benign lesion that may mimic biliary malignancy, making preoperative diagnosis challenging. We report a case of an enhancing lesion at the cystic duct stump after cholecystectomy that was diagnosed by endoscopic ultrasound\u2010guided tissue acquisition (EUS\u2010TA). Imaging studies revealed an 8\u2010mm enhancing nodule at the cystic duct stump, and endoscopic retrograde cholangiopancreatography showed a unilateral filling defect at the corresponding site. Peroral cholangioscopy demonstrated smooth mucosa without irregular vessels, suggesting a submucosal lesion rather than mucosal malignancy. EUS revealed a well\u2010demarcated, homogeneous hypoechoic mass immediately distal to the origin of the remnant cystic duct. EUS\u2010TA using a 22\u2010gauge needle enabled TA from the lesion. Histopathological examination showed proliferation of spindle\u2010shaped cells with wavy nuclei, and immunohistochemical staining was positive for S\u2010100 protein, confirming the diagnosis of traumatic neuroma. No procedure\u2010related adverse events occurred, and unnecessary surgical resection was avoided. EUS\u2010TA may facilitate preoperative diagnosis of cystic duct stump traumatic neuroma and help guide appropriate management.<\/jats:p>","DOI":"10.1002\/deo2.70406","type":"journal-article","created":{"date-parts":[[2026,8,20]],"date-time":"2026-08-20T09:19:16Z","timestamp":1787217556000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Preoperative Diagnosis of the Bile Duct Traumatic Neuroma by Endoscopic Ultrasound\u2010guided Tissue Acquisition: A Case Report"],"prefix":"10.1002","volume":"7","author":[{"given":"Kiyohiro","family":"Saito","sequence":"first","affiliation":[{"name":"Department of Gastroenterology Shiga University of Medical Science Hospital Shiga Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shunya","family":"Oi","sequence":"additional","affiliation":[{"name":"Department of Gastroenterology Shiga University of Medical Science Hospital Shiga 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