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Borderline Brenner Tumor

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Borderline Brenner tumor consisting of proliferating nests of transitional cells in a fibromatous stroma.

Some authors distinguish between proliferating Brenner tumor which lacks significant cytologic atypia and resembles low-grade papillary urothelial carcinoma and borderline Brenner tumor which can have severe cytologic atypia and resemble high-grade urothelial carcinoma. In either case, there is no stromal invasion.

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