{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,5,13]],"date-time":"2025-05-13T15:14:40Z","timestamp":1747149280390,"version":"3.40.5"},"reference-count":15,"publisher":"Wiley","issue":"6","license":[{"start":{"date-parts":[[2021,9,17]],"date-time":"2021-09-17T00:00:00Z","timestamp":1631836800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc\/4.0\/"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["IJU Case Reports"],"published-print":{"date-parts":[[2021,11]]},"abstract":"<jats:sec><jats:title>Introduction<\/jats:title><jats:p>Pyelocalyceal diverticulum is a rare disease sometimes difficult to distinguish from cysts. We report a case of urothelial carcinoma originating from a pyelocalyceal diverticulum, difficult to distinguish from cystic renal cell carcinoma preoperatively.<\/jats:p><\/jats:sec><jats:sec><jats:title>Case presentation<\/jats:title><jats:p>A 51\u2010year\u2010old Japanese man complained of gross hematuria. Computed tomography revealed a solid mass in one of the many cystic lesions in the left kidney. He was diagnosed with left cystic renal cell carcinoma and underwent retroperitoneal laparoscopic nephrectomy. Pathological examination revealed high\u2010grade invasive urothelial carcinoma arising within the renal pyelocalyceal diverticulum. The definitive diagnosis was high\u2010grade invasive urothelial carcinoma (pT3). In retrospect, the retrograde pyelography findings indicated the cyst and urinary tract connection. Residual ureterectomy and adjuvant chemotherapy were later performed. The patient has since been recurrence\u2010free.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>Whether cystic renal cell carcinoma is suspected on imaging, pyelocalyceal diverticulum should be considered a differential diagnosis, though unlikely to be encountered in daily practice.<\/jats:p><\/jats:sec>","DOI":"10.1002\/iju5.12361","type":"journal-article","created":{"date-parts":[[2021,9,18]],"date-time":"2021-09-18T06:50:55Z","timestamp":1631947855000},"page":"407-410","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["A case of pyelocalyceal diverticulum urothelial carcinoma that was difficult to distinguish from cystic renal cell carcinoma preoperatively"],"prefix":"10.1002","volume":"4","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8609-3740","authenticated-orcid":false,"given":"Iori","family":"Matsuda","sequence":"first","affiliation":[{"name":"Departments of Urology Kagawa University Faculty of Medicine Kagawa Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yasuyuki","family":"Miyauchi","sequence":"additional","affiliation":[{"name":"Departments of Urology Kagawa University Faculty of Medicine Kagawa Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Takayoshi","family":"Miura","sequence":"additional","affiliation":[{"name":"Departments of Urology Kagawa University Faculty of Medicine Kagawa Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Takuma","family":"Kato","sequence":"additional","affiliation":[{"name":"Departments of Urology Kagawa University Faculty of Medicine Kagawa Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hiroyuki","family":"Tsunemori","sequence":"additional","affiliation":[{"name":"Departments of Urology Kagawa University Faculty of Medicine Kagawa Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Nachino","family":"Kimura","sequence":"additional","affiliation":[{"name":"Department of Diagnostic Pathology Kagawa University Faculty of Medicine  Kagawa Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yumi","family":"Miyai","sequence":"additional","affiliation":[{"name":"Department of Diagnostic Pathology Kagawa University Faculty of Medicine  Kagawa Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Reiji","family":"Haba","sequence":"additional","affiliation":[{"name":"Department of Diagnostic Pathology Kagawa University Faculty of Medicine  Kagawa Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mikio","family":"Sugimoto","sequence":"additional","affiliation":[{"name":"Departments of Urology Kagawa University Faculty of Medicine Kagawa Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2021,9,17]]},"reference":[{"key":"e_1_2_13_2_1","first-page":"29","article-title":"Calyceal diverticula: a comprehensive review","volume":"16","author":"Waingankar N","year":"2014","journal-title":"Rev. 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