{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,6]],"date-time":"2026-10-06T07:51:08Z","timestamp":1791273068853,"version":"4.1.0"},"reference-count":18,"publisher":"Wiley","issue":"6","license":[{"start":{"date-parts":[[2026,4,20]],"date-time":"2026-04-20T00:00:00Z","timestamp":1776643200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2026,4,20]],"date-time":"2026-04-20T00:00:00Z","timestamp":1776643200000},"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":["Cytopathology"],"published-print":{"date-parts":[[2026,11]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:p>Small cell carcinoma of the urinary bladder (SCCB) is a rare and highly aggressive neuroendocrine neoplasm that poses significant diagnostic challenges, particularly on urine cytology. We report a case of a 68\u2010year\u2010old man with painless hematuria in whom SCCB was initially detected on voided urine cytology. Cytologic evaluation revealed small malignant cells with high nuclear\u2010to\u2010cytoplasmic ratios, nuclear moulding, finely granular chromatin, necrotic background and apoptotic debris, raising suspicion for a neuroendocrine carcinoma. Immunohistochemical studies performed on the urine cell block supported this diagnosis. Subsequent transurethral resection demonstrated a predominant high\u2010grade neuroendocrine carcinoma admixed with conventional high\u2010grade urothelial carcinoma, confirming primary bladder origin. This case highlights the importance of careful cytomorphologic assessment, the diagnostic value of cell block immunohistochemistry and the limitations of the Paris System in classifying non\u2010urothelial malignancies encountered in urine specimens.<\/jats:p>","DOI":"10.1111\/cyt.70081","type":"journal-article","created":{"date-parts":[[2026,4,20]],"date-time":"2026-04-20T11:08:37Z","timestamp":1776683317000},"page":"667-672","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["When Small Cells Matter: Diagnosing Bladder Small Cell Carcinoma on Urine Cytology"],"prefix":"10.1111","volume":"37","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0079-4459","authenticated-orcid":false,"given":"Haley","family":"Corbin","sequence":"first","affiliation":[{"name":"Department of Pathology UPMC\/University of Pittsburgh School of Medicine  Pittsburgh Pennsylvania 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