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Abstract

The ability to consistently diagnose low-grade urothelial neoplasia (LGUN) in urinary cytologic specimens remains controversial. Cytologically, we cannot unequivocally distinguish among the different types of LGUN such as urothelial papilloma, papillary urothelial neoplasms of low malignant potential (PUNLMP), low-grade papillary urothelial carcinoma (LGPUC), as well as flat low-grade urothelial dysplasia. Furthermore, non-neoplastic lesions such as papillary urothelial hyperplasia may also shed pseudopapillary structures into the urine. Although cytomorphologic criteria to diagnose LGPUC in urine cytology have been described, the reported sensitivity ranges from 10 to 70 %. The main purpose of this chapter is to review the previously described cytologic criteria of LGPUC in urinary specimens and to define appropriate circumstances that enable the diagnosis of LGUN.

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Correspondence to Eva M. Wojcik .

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Wojcik, E.M. et al. (2016). Low-Grade Urothelial Neoplasia (LGUN). In: Rosenthal, D., Wojcik, E., Kurtycz, D. (eds) The Paris System for Reporting Urinary Cytology. Springer, Cham. https://doi.org/10.1007/978-3-319-22864-8_7

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  • DOI: https://doi.org/10.1007/978-3-319-22864-8_7

  • Publisher Name: Springer, Cham

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