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In this article, we present a unique case of multifocal recurrent villous adenoma involving native bladder mucosa of an augmented bladder, bilateral ureters, and renal pelvis, with coexistent foci of adenocarcinoma and neuroendocrine carcinoma, in a patient with history of augmentation colocystoplasty. We additionally discuss the pathogenesis of development of carcinoma in the setting of augmentation cystoplasty.<\/jats:p>","DOI":"10.1177\/1066896919826708","type":"journal-article","created":{"date-parts":[[2019,1,31]],"date-time":"2019-01-31T12:00:19Z","timestamp":1548936019000},"page":"450-456","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":2,"title":["Villous Adenoma Arising in the Native Bladder Mucosa and the Upper Urinary Tract With Coexisting Neuroendocrine Carcinoma Following Augmentation Cystoplasty"],"prefix":"10.1177","volume":"27","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7445-1897","authenticated-orcid":false,"given":"Anupma","family":"Nayak","sequence":"first","affiliation":[{"name":"University of Pennsylvania, Philadelphia, PA, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Brittany","family":"Depasquale","sequence":"additional","affiliation":[{"name":"University of 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