{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,13]],"date-time":"2026-10-13T09:47:50Z","timestamp":1791884870749,"version":"4.3.4"},"reference-count":20,"publisher":"Wiley","issue":"6","license":[{"start":{"date-parts":[[2026,10,13]],"date-time":"2026-10-13T00:00:00Z","timestamp":1791849600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc-nd\/4.0\/"},{"start":{"date-parts":[[2026,10,13]],"date-time":"2026-10-13T00:00:00Z","timestamp":1791849600000},"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":["IJU Case Reports"],"published-print":{"date-parts":[[2026,11]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:sec>\n                    <jats:title>Introduction<\/jats:title>\n                    <jats:p>Renal pelvic or peripelvic neuroendocrine tumors are rare and may radiologically mimic invasive upper tract urothelial carcinoma.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Case Presentation<\/jats:title>\n                    <jats:p>A man in his 70s presented with two episodes of painless gross hematuria and lower urinary tract symptoms from benign prostatic hyperplasia. Computed tomography urography and magnetic resonance imaging showed a 3.1\u2010cm enhancing mass centered at the right renal pelvis with apparent cortical invasion. However, flexible ureterorenoscopy showed intact urothelium, and renal pelvic wash cytology was negative. Upper tract urothelial carcinoma with parenchymal invasion was suspected, and single\u2010port robot\u2010assisted right nephroureterectomy with bladder cuff excision was performed. Histology revealed a well\u2010circumscribed, well\u2010differentiated neuroendocrine tumor beneath intact renal pelvic mucosa, with negative margins and a Ki\u201067 index of 4.9%. Ten\u2010month postoperative imaging showed no recurrence or metastasis.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>Submucosal renal neuroendocrine tumors should be considered when imaging suggests a renal pelvic mass but endoscopy shows no mucosal lesion.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1002\/iju5.70253","type":"journal-article","created":{"date-parts":[[2026,10,13]],"date-time":"2026-10-13T09:16:31Z","timestamp":1791882991000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Renal Neuroendocrine Tumor Mimicking Upper Tract Urothelial Carcinoma"],"prefix":"10.1002","volume":"9","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2066-2178","authenticated-orcid":false,"given":"Jia\u2010Yuh","family":"Sheu","sequence":"first","affiliation":[{"name":"Department of Urology National Taiwan University Hospital  Taipei Taiwan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yun\u2010Sheng","family":"Wu","sequence":"additional","affiliation":[{"name":"Department of Medical Education National Taiwan University Hospital  Taipei Taiwan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jeff S.","family":"Chueh","sequence":"additional","affiliation":[{"name":"Department of Urology National Taiwan University Hospital  Taipei Taiwan"},{"name":"Department of Urology, College of Medicine National Taiwan University  Taipei Taiwan"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,10,13]]},"reference":[{"key":"e_1_2_12_2_1","doi-asserted-by":"crossref","first-page":"714","DOI":"10.5858\/arpa.2015-0106-RS","article-title":"Primary Neuroendocrine Tumors of the Ureter: A Short Review","volume":"140","author":"Acosta A. 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