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Papillary Cystitis

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The stroma is fibrotic and contains chronic inflammatory infiltrate. The overlying urothelium is normal. Isolated fronds in a case of papillary/polypoid cystitis may be difficult to distinguish from urothelial carcinoma. Features favoring papillary cystitis include inflamed background, normal urothelial thickness lacking significant atypia, and non-branching broad-based fronds.

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