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 RESEARCH ARTICLE
CytoJournal 2013,  10:4

Micropapillary urothelial carcinoma: Cytologic features in a retrospective series of urine specimens


Department of Pathology and Cell Biology, New York-Presbyterian Hospital-Columbia University Medical Center, 630 West 168th Street, VC14-215, New York, NY 10032, USA

Correspondence Address:
Jonas John Heymann
Department of Pathology and Cell Biology, New York-Presbyterian Hospital-Columbia University Medical Center, 630 West 168th Street, VC14-215, New York, NY 10032
USA
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/1742-6413.107986

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Background : The micropapillary variant of urothelial carcinoma (uPC) is a rare variant of urothelial carcinoma that carries a poor prognosis. Definitive surgery may represent optimal management of low stage tumors. Urine cytology is indispensable in the screening and follow-up of urinary tract cancer. However, cytopathological criteria for diagnosis of uPC and its differentiation from conventional urothelial carcinoma (CUC) are not well-defined. Materials and Methods : Twenty-five cases of histologically confirmed micropapillary uPC from 21 patients were compared to 25 cases of histologically confirmed high-grade CUC. Results : In uPC cases, cell clusters were identified in 13 of 25 specimens from 10 patients. Six of the 13 specimens containing cell clusters corresponded to surgical pathology specimens in which micropapillary carcinoma accounted for at least 50% of total carcinoma. In contrast, only 1 of the 12 urine specimens devoid of cell clusters corresponded to surgical specimens in which micropapillary carcinoma accounted for at least 50% of total carcinoma. Cytomorphologic features of urinary specimens from patients with histologically confirmed micropapillary carcinoma were generally similar to those from patients with high-grade CUC, making it difficult to distinguish these entities in exfoliative urine specimens. Conclusions and Summary : Further investigation of the core cytopathological characteristics of uPC is warranted to refine its diagnostic criteria by exfoliative urine cytology.






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